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Java/Questions Answered by Expert Brian Ngure
| Subject | Date Asked |
| Form submission to j_security_check | 1/30/2012 |
| Q: I came across a login form in jsp as follows, <form method="post" name="login" ... A: The special resource "j_security_check" used in the action attribute of the form is a special ... | |
| Threads | 1/23/2012 |
| Q: I want to print the numbers form 1 to 100. Here i want to use two threads, one thread prints only ... A: Could you put your code up here and I can help you out. Basically, you should write the code for ... | |
| JAVA ARRAY | 1/15/2012 |
| Q: good morning sir.... actually i tried to find a value from array in java... if suppose searching ... A: You need to edit the actionPerformed method. 1. You were creating the MySQL connection but not ... | |
| JTable Searching with highlight | 1/10/2012 |
| Q: I have already searched for similar threads but with no results helping me I want to make the text ... A: Are you sure you want to highlight as opposed to filter out the extraneous results? If you highlight ... | |
| JAVA ARRAY | 1/9/2012 |
| Q: good morning sir.... actually i tried to find a value from array in java... if suppose searching ... A: You get a java.lang.StackOverflowError. This basically means that your program is running out of ... | |
| Java with Oracle | 12/31/2011 |
| Q: import java.sql.*; class Kettavan { private Connection conn; private Statement stmt; ... A: Some things to try: 1. Check that the host name is correct in the listener.ora and tnsnames.ora ... | |
| java & oracle | 12/29/2011 |
| Q: i tried most websites methods to connect java with oracle but cant... shall u guide me from the ... A: Try this. Let me know if it throws an error. import java.sql.*; class Kettavan { private ... | |
| java & oracle | 12/27/2011 |
| Q: i tried most websites methods to connect java with oracle but cant... shall u guide me from the ... A: To connect to an ORACLE database, make sure you have the Oracle DB driver jar file in your path. ... | |
| servlet | 12/27/2011 |
| Q: i am starting java programming and i want to do web programming but i dont know what should i ... A: A servlet is a server side Java program that runs inside an application server like Tomcat or ... | |
| Storing values for variables When closing | 12/5/2011 |
| Q: Hai,I want to know how to store a value for a variable when we exit from a java programe.I mean like ... A: You would have to store the value of the counter in a permanent storage on disk. You can do this in ... | |
| java | 12/3/2011 |
| Q: i am planning to build a mail server which is used in a local area network.it have to login ... A: There is no need for you to go and re-invent the wheel. There are a number of free mail servers ... | |
| Package does not exist error | 12/1/2011 |
| Q: i have installed the jdk1.7.0_01. This is the path : C:\program files\java\jdk1.7.0_01\bin i create ... A: I would advise you to read the Java documentation or Java tutorial section on paths and packages. ... | |
| Comparing Docx Files | 11/16/2011 |
| Q: I want to compare the content of 2 docx files using Java code. I have tried coupe of options using ... A: You would probably do better using the docx4j library: http://www.docx4java.org/trac/docx4j There ... | |
| platform independent | 11/4/2011 |
| Q: Can u please clear the meaning of platform independent. As java is platform independent what is the ... A: Java being platform independent means that you should be able to the write the code once (on any ... | |
| deploy war into Tomcat | 5/22/2011 |
| Q: I want to realize a wizard that installs my web application (*.war), but I don t know how to deploy ... A: You don't need a wizard to deploy WAR files. Deployment is as simple as copying the war file to your ... | |
| A computer mystery | 1/17/2011 |
| Q: Brian Hope you've been doing well. Ever since I've purchased a new wireless Microsoft mouse for my ... A: Your problem sounds like a hardware error. Can you try get updated drives for the mouse? Also, ... | |
| Utilization exceed 100% | 10/22/2010 |
| Q: Can you help me please in the following: I used Java to implement server/client approach I have one ... A: Perhaps you could use the ExponentialGenerator class: ... | |
| Attendace: I can't find the answer | 10/22/2010 |
| Q: Sir, I cannot find the answer that you gave for the following problem. Can you help me out? I am a ... A: Using an example from one the links I sent you, you would need to store the attendance information ... | |
| HitTing the URL With some parameters | 10/22/2010 |
| Q: I have a URL with some parameters ... A: You could use curl java located at: http://curl.haxx.se/libcurl/java/ But here is a basic example. ... | |
| Java in Office | 10/21/2010 |
| Q: I am a beginner, and I need help immediately. Being the manager of an office, I need to maintain ... A: In order to retain the value of attendance, you will need to store the last value in either a text ... | |
| java program(netbeans) | 6/14/2010 |
| Q: Your Open QuestionShow me another » Java application help? write an application that propmts for ... A: You need to read the users name e.g. // Prompt the user to enter their name (do the same for name2) ... | |
| To retrive data from database and print them to text area in new line | 3/11/2010 |
| Q: i want to print the data from database to my text area in java swing i get the output but it comes ... A: Try this: try { //ResultSet rs = null; pstatement = con.prepareStatement("SELECT ... | |
| Help me | 3/10/2010 |
| Q: Sir, I'm doing Master of computer application(MCA) final year project. I have choosen a project ... A: I have not done anything like this before, but I expect you will have to make extensive use of SNMP. ... | |
| Could not find main class | 3/7/2010 |
| Q: I have a problem in opening a .jar file I am currently using Netbeans IDE and I had created a ... A: There could be a number of reasons. Try the following: 1. Make sure that the JAR file has a ... | |
| computer | 3/7/2010 |
| Q: what will happen if we do not use the break statement at the end of each case block of switch case ... A: If there is no break, then the code in all of the cases after the selected on will be executed. ... | |
| Java titleCase String Tokenizer | 3/3/2010 |
| Q: I really need help! Im currently studying Java programming in college and really stuck with this ... A: Try this: public class Capital { /* * This program will print a copy of the line in which ... | |
| running applet | 1/27/2010 |
| Q: I have an applet witch cantons following code : System.setProperty("proxySet", "true"); ... I set ... A: It seems like your security policy file is either not being read or is incorrect when running from ... | |
| writing a method | 1/23/2010 |
| Q: i have been trying to write this method for moving a queen on a chess board but i can't get it. if ... A: You should not use commas in an if..else statement. Try this: if (((fromrow < 0) || (fromrow > 7)) ... | |
| filing in java | 1/21/2010 |
| Q: i have some text in urdu language in abc.txt file i want to save it on the string in the console ... A: Have a look at these examples: http://www.java2s.com/Code/Java/I18N/Encoding.htm Also see: ... | |
| filing in java | 1/20/2010 |
| Q: i have some text in urdu language in abc.txt file i want to save it on the string in the console ... A: Assuming that you have done everything correctly in Java like specifying the language preferences ... | |
| Creating a Custom Filename Extension in JAVA | 1/19/2010 |
| Q: AS part of the final year engineering project, I am developing a PDF reader and there are some extra ... A: To save a document with a different extension, you just need to specify the extension you want. You ... | |
| Java Query | 1/15/2010 |
| Q: Please tell me the output of the following program written in Java! class a{ public static void ... A: In order to follow the program step-by-step, I suggest you use an IDE like Netbeans which you can ... | |
| Use of regular expression in java | 1/14/2010 |
| Q: How is check the date using regular Expression..and also i want to check that the date is not exceed ... A: Have a look at these two: import java.util.regex.Matcher; import java.util.regex.Pattern; ... | |
| java | 1/14/2010 |
| Q: Could you help me with this question ,it's going to be for my exam or something like this!!! I need ... A: a) Both i and j are positive. if ((i >= 0) && (j >= 0)) // If you consider 0 to be a positive ... | |
| Image Decryption Problem | 1/11/2010 |
| Q: Plzzz check my code and tell me what happen if i encrypt file it shows image no preview avialable ... A: It does work. You just have to write a little code: //Encrypt file: import ... | |
| JAVA | 1/10/2010 |
| Q: Sir, Belated Happy New Year Wishes. Will You Please mail me the difference between PrintStream & ... A: A look at the Java documentation will answer your question. I quote: PrintStream extends ... | |
| Java Help | 1/8/2010 |
| Q: I have been learning Java Programming briefly for a little less then a month. I have learned to ... A: Methods have parenthesis after them e.g. prime(), sometimes with variable parameters e.g. prime(int ... | |
| CODE for the question I asked previously | 9/10/2009 |
| Q: import javax.swing.JOptionPane; public class Assign2 { // main method begins execution of Java ... A: Because you are using do {...} while, the code inside do will run at least once no matter what ... | |
| Solution for a Java problem | 9/10/2009 |
| Q: Sir, I have read an excel file using java.I stored all the cell contents in a string array.One ... A: I'm not sure exactly what the problem is. To move to the next cell, you just need to call ... | |
| LinkedList | 9/8/2009 |
| Q: Brian, Hopefully you can answer my question, as Google has failed me! :) I'm using a LinkedList as ... A: Sorry, but I have not been able to find any reason why this is happening. I have had a look at the ... | |
| swap 2 numbers | 9/3/2009 |
| Q: I wanna simple java code to swap 2 numbers without using 3rd variable and these 2 numbers should be ... A: Here is a simple example of how to get keyboard input: import java.io.*; public class TestReadLine ... | |
| Java Questions | 9/2/2009 |
| Q: Hey, I'm a Java newbie and I just ran into some confusing programs without explanation, can you help ... A: It's not easy to find out where objects exist in memory in Java. In C or C++ you have pointers. ... | |
| Java Questions | 9/1/2009 |
| Q: Hey, I'm a Java newbie and I just ran into some confusing programs without explanation, can you help ... A: 1) Yes. Automatically false. 2) Put a space between the time and PM 3) Different objects because ... | |
| java | 2/18/2009 |
| Q: I want to get a sample java software for medical diagnosis of heart disease of data mining(decision ... A: The main thing you need to do is research. Don't re-invent the wheel. Look for code, libraries, etc ... | |
| system calls specific to OS | 2/16/2009 |
| Q: hai again I read that the java functions will be eventually calls to the native OS. So I unzipped ... A: I am glad that you are looking into Java this far. Most people do not. The system calls are normally ... | |
| Java | 2/13/2009 |
| Q: I'm not sure if this is in your field but seen as you know Java maybe you could help. I'm trying ... A: Sorry, can't help you there. It sounds like the operating system has become corrupted somehow. Maybe ... | |
| Java | 2/13/2009 |
| Q: I'm not sure if this is in your field but seen as you know Java maybe you could help. I'm trying ... A: In that case, it sounds like you might be having hard disk problems. Any weird noises from your hard ... | |
| Java | 2/12/2009 |
| Q: I'm not sure if this is in your field but seen as you know Java maybe you could help. I'm trying ... A: Could you give me some information? Anything in the Event logs? Is there a specific error message ... | |
| trimToSize() method | 2/5/2009 |
| Q: I am making an array of objects. I will not paste all my code, my methods are working except for ... A: The objects array will not be modified in ths method. Try create a new objects array and return it. ... | |
| Array of Objects | 2/2/2009 |
| Q: Let me first tell you that I'm new to Java :) I'm trying to make an array of objects with 3 ... A: MyArray() This simply creates ablank new MyArray object with nothing in it. e.g. MyArray arr = new ... | |
| Simple Java | 10/27/2008 |
| Q: Please tell me why this program won't print out the sweets passed in on the command line. Obviously ... A: You have forgotten to make the main(String[] args) method static. Also, you should use the equals() ... | |
| limewire+java+usb | 10/26/2008 |
| Q: I have made a portable limewire pro version 18.8 i have put it on my usb (and also installed another ... A: Check to see if limewire has a configuration file (a text file of some sort). If it does, see if ... | |
| Creating a palindrome program | 10/20/2008 |
| Q: I'm trying to create a program that can do the following...prompt and get a forward string and check ... A: Please have a look at the following three examples of writing palindrome code. Pick the one that ... | |
| thread | 10/20/2008 |
| Q: i have to do assignment base on java thread. so i need 2 develop a little game using this.i only ... A: Here are two links on Thread tutorials. Very simple 5 minute read. ... | |
| write a program to calculates and prints....(please help) | 10/18/2008 |
| Q: Write a program to calculates and prints the monthly paycheck for an employee.The net pay is ... A: You need to get the user input twice, using two separate JOptionPanes. Once for the amount and once ... | |
| Getting NoClassDefFoundError in simple program | 10/16/2008 |
| Q: Here's my super simple program: //Code start public class hello{ public hello(){ } public ... A: You need to add Java to your classpath. Do this: Right click "My Computer" -> Properties -> -> ... | |
| JFileChooser + DES File encryption | 10/15/2008 |
| Q: I am designing an Encryption & Decryption application, the problem is that the source code that I ... A: You need to use one or the other. Either use: public static void openFile() { File file = ... | |
| Program I am trying to write | 10/15/2008 |
| Q: I have to add narration to a transport method in a agent class that involves a figure moving from ... A: You could assign "small room" and "big room" to variables and interchange them based on which ... | |
| Java and swf file | 10/15/2008 |
| Q: .. i would like to ask if is it possible to import swf file or any macromedia flash file to your ... A: I have not done this before, but please have a look at this link for a howto: ... | |
| Username & Password | 10/14/2008 |
| Q: I am trying to create a script that would allow users of a website to create a username and ... A: Please ask your question in the JavaScript forum. This forum is for Java questions. Here is a link ... | |
| Minesweeper using Java | 10/12/2008 |
| Q: I'm doing a on a program like that of the minesweeper and I'm now having trouble on uncovering the ... A: It may not be running properly because some of the graphics (images) are missing. Just double check ... | |
| JFileChooser + DES File encryption | 10/12/2008 |
| Q: I am designing an Encryption & Decryption application, the problem is that the source code that I ... A: To use a JFileChooser, try something like this: JFileChooser chooser = new JFileChooser(); public ... | |
| project idea | 10/10/2008 |
| Q: we have decided to implement the following scenario as our final year project.... tell whether it is ... A: Yes it is feasible, but you will have to use external libraries such as the iText library for PDF ... | |
| Bit Operation in JAVA | 10/10/2008 |
| Q: int newRed = (0xff000000 | (0xc0 << 16) | (0x00 << 8) | 0x00). This line of code is ... A: The hex values are how numbers are calculated for colours in the RGB format. ff = 255 c0 = 192 00 = ... | |
| FirePropertyChange | 10/6/2008 |
| Q: .. i would like to ask 1. what is the importance of firePropertyChange and the ... A: You would use these when you want to check if an object, e.g. a textfield has changed its ... | |
| Exporting table results to excel | 10/3/2008 |
| Q: I have an ArrayList with results that I export to excel like so: package ... A: When adding the titles, try specifiying the format at that time. e.g. s.addCell(new Label(0, 0, ... | |
| loading images in java | 10/3/2008 |
| Q: Brian Probably the subject says it all. How can I load a .JPEG image in java?? Just the simplest ... A: This is just about the simplest method: ... | |
| JTable and JExcell | 10/3/2008 |
| Q: .. I'm new in using JTable and JXL... but i just want to know or if its not too much i would like to ... A: All the information you need is there together with some examples. The download also has all the API ... | |
| set textfield with database values.. | 10/2/2008 |
| Q: i created the swing table that retrieve values from database and display that values.if i select ... A: Your problem is becoming clearer to me. You need to get the row number that was clicked in the ... | |
| SWING programming-display window at center | 10/2/2008 |
| Q: i have created a window that has menu item.when i click that menu item, new window is opened..i want ... A: Try this: /** * Centers the target component on the screen. * <p> * @param ... | |
| Minesweeper using Java | 10/2/2008 |
| Q: I'm doing a on a program like that of the minesweeper and I'm now having trouble on uncovering the ... A: 1. You can use a javax.swing.JFormattedTextField with a java.text.NumberFormat as the format. ... | |
| swing textarea | 10/1/2008 |
| Q: how to retrieve data from mysql database and display that data in text area?pls let me know with ... A: Try something like this: String query = "SELECT name1, name2 FROM table1"; PreparedStatement stmt ... | |
| accept value from a table | 10/1/2008 |
| Q: i want to select a row form a table and assign the fields of the table to text fields.i created the ... A: If by first row you mean only the column headers, try this: private void ... | |
| swing | 9/30/2008 |
| Q: i want to retrieve data from swing table (not from database)table and it should be displayed in ... A: See the previous answer: if (e.getActionCommand() == "SELECT") { try { ... | |
| accept value from a table | 9/29/2008 |
| Q: i want to select a row form a table and assign the fields of the table to text fields.i created the ... A: Try this: private void patientidfieldActionPerformed(java.awt.event.ActionEvent evt) { ... | |
| java.awt.toolkit error in ubuntu | 9/26/2008 |
| Q: im using Ubuntu as my Operating System n netbeans IDE6.0 for creating java application.. when i try ... A: That's the right Java to use. You might try setting your classpath and checking if an alternate Java ... | |
| Minesweeper using Java | 9/26/2008 |
| Q: I'm doing a on a program like that of the minesweeper and I'm now having trouble on uncovering the ... A: You must have the locations of the mines stored somewhere in an array, vector or hashtable. What you ... | |
| edit existing excel file using JXL in java | 9/25/2008 |
| Q: .. im just a newbie when it comes to programming in java... but im really interesting and would ... A: The problem might be in the Maths. Remember, division in Java is complicated. You need to use the ... | |
| edit existing excel file using JXL in java | 9/24/2008 |
| Q: .. im just a newbie when it comes to programming in java... but im really interesting and would ... A: Have you had a look at the tutorial http://www.andykhan.com/jexcelapi/tutorial.html All the ... | |
| showing jframe | 9/23/2008 |
| Q: i want to ask again..I create a mainform using jframe.I set the width and the height according the ... A: With JOptionPane, the first argument is for the owner of the option pane. Do not leave it null, but ... | |
| need help | 9/22/2008 |
| Q: i want to ask.I got code like this,i want to ask how to make the program display error message if ... A: Try this: try { Class.forName("com.mysql.jdbc.Driver"); String URL = ... | |
| Java help please | 9/21/2008 |
| Q: I am writing a program for my programming class where we have to write a program that determines the ... A: Please see my example to work it out: For example, 31 % 9 results in 4 because 9 goes into 31 three ... | |
| Java help please | 9/21/2008 |
| Q: I am writing a program for my programming class where we have to write a program that determines the ... A: You need to read up on the modulus operator (%). Division in Java only gives you whole numbers, not ... | |
| need help | 9/21/2008 |
| Q: i can't use the follow up..It says to much..The txtPwd.setfocusable(true) is the remains of the ... A: You could pass the string in the constructor of the new JFrame: public NewJFrame(String user) { } ... | |
| Java SDK getting Started | 9/18/2008 |
| Q: I work in technical support and am just trying to learn something about coding. I downloaded ... A: Try this. System variables are usually all caps, so: 1. ANT_HOME=C:\Ant 2. JAVA_HOME=C:\JDK 3. ... | |
| need help | 9/18/2008 |
| Q: i can't use the follow up..It says to much..The txtPwd.setfocusable(true) is the remains of the ... A: To move to the password field after pressing enter in the user name field, you need to check which ... | |
| cannot directly filling the jpasswordfield | 9/17/2008 |
| Q: i want to ask again..I've created a login form,my problem is that when i run the project,i can't ... A: On Ubuntu, sometimes with text or password fields, I have noticed that you need to middle click ... | |
| Question on Nested Classes and JSP? | 9/16/2008 |
| Q: I have two questions one on Java Nested classes and the other on JSP i am preparing for java ... A: Try this code for nested classes: public class NestExample { public static void main(String ... | |
| need help | 9/12/2008 |
| Q: i need help.I've created a jdialog for login form and a jframe for the main app by using netbeans ... A: To do this should be more or less the reverse of what you do to display the main form. In your ... | |
| Designing in JFrame | 9/7/2008 |
| Q: I developed one encryption software in Netbeans IDE 6.0(JAVA) with use of JFrame. Now i want to make ... A: You need to extend JFrame. Something like this: import java.awt.BorderLayout; import ... | |
| jdbc | 9/5/2008 |
| Q: Brian i would like to insert into my database a date in the format DD-MON-YYYY so far, i have the ... A: You need to do something like this: try { stmt = conn.prepareStatement("INSERT INTO ... | |
| creating an object from Class variable | 9/4/2008 |
| Q: Brian I have the following code inside my main method /* code begins here Class personclass = ... A: Remember that you need to use the fully qualified name of the desired class in forName() e.g. ... | |
| java | 8/28/2008 |
| Q: I am shukle parnash from Gujarat in India. I am student of MCA(Master In Computer Application) I ... A: To make a JAR file executable, you need to specify the main class of the application in the ... | |
| Double value Handling in java | 8/26/2008 |
| Q: I am getting a Value from query as "53310588.75" as String. When i convert into double value using ... A: You need to use the NumberFormat and DecimalFormat classes to format the number the way you want. ... | |
| abstract classes and concrete classes | 8/26/2008 |
| Q: let's say i create a subclass derived from another abstract class let's say i only wanted to use a ... A: You must include the other abstract methods. You do not need to implement them, you could leave them ... | |
| set CLASSPATH and packages | 8/25/2008 |
| Q: brian i'm learning about packages in java i dont get the purpose of set CLASSPATH what is its ... A: You normally set the classpath so that the the Java compiler and interpreter can find and run ... | |
| JFileChooser | 8/18/2008 |
| Q: i'm trying to make an application that read a .txt file from HDD,i created a button "open" so when i ... A: To find out how to use JFileChooser, please have a look at the following link. ... | |
| JFileChooser | 8/15/2008 |
| Q: i'm trying to make an application that read a .txt file from HDD,i created a button "open" so when i ... A: I would suggest you look at some of the free libaries available that can read and write to/from CSV ... | |
| JAVA | 8/13/2008 |
| Q: What is Java and its purpose ??? I can't remember why I down loaded it, and to this day I have ... A: Java is software used to run various programs. For example, some online chat programs use Java ... | |
| HashMap vs Hashtable | 8/13/2008 |
| Q: What Hashtable does not allow null in both key and value, where as HashMap does? ANSWER: Hi, Not ... A: As any software evolves, new features are added. The ability to have null values was added in a ... | |
| reading a single char in java | 8/13/2008 |
| Q: Brian I just want to know how to read a single char from the keyboard in java thanks A: import java.io.*; /** *This class demonstrates how to read a line of text from the keyboard. */ ... | |
| Java program design | 8/12/2008 |
| Q: I'm new to java and decided I'd try my first program that involved abstracting my program into ... A: Unchecked or unsafe operations simply means that you should specify the type of elements that you ... | |
| public, private and protected | 8/12/2008 |
| Q: Our professor in computer science asked us the symbols used by public, private and protected when ... A: I suppose it would depend on the IDE a person was using, but generally, public methods have a simple ... | |
| HashMap vs Hashtable | 8/11/2008 |
| Q: What Hashtable does not allow null in both key and value, where as HashMap does? A: Not really sure what your question is. However, both provide key-value access to data. The Hashtable ... | |
| JSP | 8/9/2008 |
| Q: I want to know that how I can put Rsultset value of a column in Input Value to be read in next JSP ... A: You would need to use a session to store the ResultSet value. Something like: HttpSession session = ... | |
| Convert a for loop to while loop | 8/8/2008 |
| Q: I do not know how to convert a for loop to a while loop. I'm lost!! Here is the code. import ... A: Here is the code using a while loop. import javax.swing.JOptionPane; public class ForLoop { ... | |
| can we hyperlink a pdf file and a ppt in java? | 8/2/2008 |
| Q: sir, i am building a software , am not using netbeansa or any other ide, rather am coding in the ... A: You could create a mouselistener on a JLabel, clicking on which the pdf file should open. For ... | |
| java warning message | 8/2/2008 |
| Q: Brain I use the LinkedList class from java.util.* package in order to create a list of objects but ... A: This "warning" comes about because of generics. The code should should work fine. If you don't want ... | |
| Enquiry about Text on Java | 5/9/2008 |
| Q: .. I have the following trouble If I have a text file (.txt) like this: "II. VARIACION DE LAS ... A: You nned to read the file into a String. You can then call the setContent method with that string. ... | |
| java install | 5/8/2008 |
| Q: I love to play pogo, but I sometimes get a message that the applet is corrupt, I've done everything ... A: What you could try is renaming the existing the Java installation directory and then installing a ... | |
| Enquiry about Text on Java | 5/5/2008 |
| Q: .. I have the following trouble If I have a text file (.txt) like this: "II. VARIACION DE LAS ... A: Basically you need to split the original string into component parts. You can split on a specific ... | |
| Java applets not loading | 5/1/2008 |
| Q: I have been unable to do my taxes online this year because of an error I get continously-java ... A: You could be getting the error for a number of reasons. It could be the browser version, the Java ... | |
| java help | 4/30/2008 |
| Q: Im a beginner in java,Im stuck with my assignments, pls help me? I have to 1) Write a program to ... A: You are going in the right direction. You have so far basically done part 1 and part 2 (Display all ... | |
| hey. Computer Science wants to KILL me | 4/29/2008 |
| Q: i am a first year and doing Comp sci as my major. We doing Java and we have been asked to develop a ... A: As I stated, the LCM is calculated by: LCM = (a * b) / gcd(a, b); You get the gcd from the ... | |
| syllable the words | 4/29/2008 |
| Q: i want to make program in java (eclips)which can syllable the words...yeah it should separate in ... A: 1. You are not very clear about you want. 2. This looks like like homework. 3. Here are a couple of ... | |
| the use of text files | 4/24/2008 |
| Q: This is a question i waz given by my computer science lecture and i dont have an idea how to ... A: Load the dictionary into something like an array inside the spellchecker class. You can then check ... | |
| netbeans 5.5.11 | 4/24/2008 |
| Q: can ||(or) condition be used in netbeans with the if statement? and can u please send me the code ... A: Yes you can use || (OR) in an if statement. e.g. [Pseudo code] if(booleanCondition1 || ... | |
| splitting an image | 4/23/2008 |
| Q: am marla from brunei. Basically, am a student in computing and currently am doing jigsaw puzzle ... A: Here is some sample code: ---------------------------------------- import java.applet.Applet; ... | |
| netbeans 5.5.1 | 4/22/2008 |
| Q: how to move from one frame to the other on the click of a button? A: If you mean make the other frame the selected (active) frame, try this inside the actionPerformed ... | |
| netbeans 5.5.1 | 4/22/2008 |
| Q: how to access the data entered in JTextField of 1 frame into the JTextField of other frame.please ... A: There are a number of ways you could go about this. 1. Make the JTextField of frame 2 static the ... | |
| java rmi | 4/21/2008 |
| Q: im writing a chat program using java rmi client server base. mmm why do i need a two way rmi? ie why ... A: It is possible to make the client program act as a server, but most chat programs have the client ... | |
| packages | 4/18/2008 |
| Q: the following program is not compiling can u tell me why?package com.perfect.ecommerce; import ... A: The error you are getting simply means that the file name should be called Item.java However, when ... | |
| matrix multiplication | 4/18/2008 |
| Q: i have the following question how can i multiply 2 matrices? the rules are the following (assume ... A: Try something like this: MatrixFunc.java (matrix multiply code). ReadMatrix.java (read matrices ... | |
| Problem in displaying tables from a web page | 4/18/2008 |
| Q: amazon.com and I would like to extract the tables in that particular web page would somebody out ... A: You could search for nested tags. Here's how: Assume that the final string you have has two tables, ... | |
| Screen saver custom text | 4/17/2008 |
| Q: Brian. Why can I only put no more than 20 words on my computer screen saver to see? Is it possible ... A: As far as I can see, you are limited to 20 characters because the 3D text must be able to display ... | |
| java portable | 4/17/2008 |
| Q: I am playing chess in the internet and for that i require java. I have a computer at school that ... A: You could try copying the JDK or JRE folder onto your USB and starting the program by pointing to ... | |
| Problem in displaying tables from a web page | 4/14/2008 |
| Q: amazon.com and I would like to extract the tables in that particular web page would somebody out ... A: Just search each line of input for the table open and close tags. Then store the tables in a ... | |
| java code using netbeans 6.0 | 4/13/2008 |
| Q: i am make application in swing component. In tht I have One form where i want add a tree left side ... A: You need to override the default options entered for the JTree with your own. Please see: ... | |
| coding question | 4/12/2008 |
| Q: I hope you can help me! I'm creating a website for a friend's company and I ran into an issue with ... A: I don't really find anything wrong with your coding. You might want to try indenting you code though ... | |
| Java Program | 4/11/2008 |
| Q: I have to create a method called create palette that creates a digital method that is a color ... A: private Palette createPalette(Object info) { // Create colour palette here ... return ... | |
| having Problem in inserting values from HTML into Database through JSP | 4/11/2008 |
| Q: i m a student working on a project Visitor Gatepass System.I have to insert values in Databse ... A: Please see my other answer. For a quick tutorial on JSP's please see: ... | |
| connectivity of html with database | 4/9/2008 |
| Q: i m a student working on a project Visitor Gatepass System.I have to insert values in Databse ... A: To input values from a web page you will need to use a JSP page and possibly a servlet to process ... | |
| iframe zooming | 4/8/2008 |
| Q: I have six jsp pages displayed on a single html page by using iframes. I want that if user clicks on ... A: Not really sure if this will help you, but I've seen it in a couple of forums: // In the head tags ... | |
| Dice Simulation | 4/5/2008 |
| Q: My programming teacher gave me thisWrite a program that will simulate the result of throwing of a ... A: Generating the numbers is simple: [Pseudo-code] int x = (int) (Math.random() * 10); // Trim ... | |
| read a word file and parse for a number using java | 4/4/2008 |
| Q: I have to open a word file, parse it for a number which is located mostly 3rd or 4th line from last, ... A: There are a number of libraries available to parse Microsoft document formats. Have a look at these ... | |
| java code using netbeans 6.0 | 4/3/2008 |
| Q: i am make application in swing component. In tht I have One form where i want add a tree left side ... A: Sorry for the delay answering. To add a tree, select a new JTree from the palette menu on the right ... | |
| J2EE | 3/3/2008 |
| Q: I m displaying records on JSP page. and also check box with each record. For deleteing Cheked record ... A: I made a JSP page that did something like this: 1. Using a StringBuilder, I created the checkboxes ... | |
| New line in Lotus Notes document | 3/2/2008 |
| Q: I already asked Neil for this but Im trying evething I can. Our previous chat about my problem is ... A: I have not personally used Lotus Notes. From what I have seen in the little documentation I could ... | |
| Exel access through java | 12/13/2007 |
| Q: i am developing a java app, where i need to use Excel as the database. the difficulty that i facing ... A: There are a number of libraries available to read/write to excel. Have a look at: ... | |
| recieving double or float input from console | 12/11/2007 |
| Q: ive been working on this easy program forever it seems i just converted from Qbasic and im a bit ... A: Sorry for the delay in answering. Yes, you can use the BufferedReader to read doubles. Try something ... | |
| java | 12/4/2007 |
| Q: Can scan all the roots (drives like A:, C:,E:c). Asks (by command line) which roots not to scan ... A: Most of what you are looking for is available from the JDK API documentation. e.g. java.io.File has ... | |
| stroring arabic data keyed in by user | 12/3/2007 |
| Q: Sir, System Specifications: 1.J2EE-AppServer - Pramati4.1 2. DataBaseServer - MSSql 2005 3. ... A: It looks like you have checked all the places I would look for the problem. Have you checked the ... | |
| Java maze | 12/2/2007 |
| Q: I'm having a hard time trying to create a maze that randomly generates path and walls. All I know is ... A: Here are some links where you can find examples of how you would go about doing this: ... | |
| Java | 11/28/2007 |
| Q: I wrote a program to read palindromes but I want it to ignore spaces, capitalizations, and ... A: You should covert the string either to upper case or lower case first and then strip all characters ... | |
| Installing Java on HP/Compaq Windows Vista Home Premium | 11/27/2007 |
| Q: I just bought this computer and I have been trying for days to download Java. I can't access things ... A: My advice is to first stop using internet explorer as your primary web browser. Go to www.opera.com ... | |
| objects in hashset | 11/26/2007 |
| Q: How do I use HashSet in this problem: I have a class Word: public class Word{ private String ... A: I think what you are after is getting the word "banana" printed out. To do this, you can't use ... | |
| please help me | 11/22/2007 |
| Q: what is the delimeter needed to search using Scanner for the first name of this data: Magdy, pop, ... A: You could either use: \b A word boundary or \S A non-whitespace character: [^\s] or \W A ... | |
| how to start my project | 11/21/2007 |
| Q: iam abt to start my project which is a part of my academics n i have an little knowledge abt Java n ... A: Having all those features will be a lot of work. Take for example Google, who took months to get ... | |
| Arraylist | 11/19/2007 |
| Q: I am very confuse about the arraylist and I would like to check with you guy with my understanding ... A: Correct to the first two. As for number three, it is recommended that you use generics and declare ... | |
| Needing help solving a Java problem | 11/15/2007 |
| Q: I'd like to know how to Write a class Palindrome (), that accepts a string and confirms or denies ... A: Try something like this: // This method returns 'true' if the parameter // is a palindrome, a ... | |
| extracting portion of text sing java | 11/14/2007 |
| Q: I wish to know how java can be used to extract part of a text file. The situation is like this: I ... A: Look for the starting and ending word positions using the String method indexOf(). e.g. int start ... | |
| connect algorithm | 11/13/2007 |
| Q: How are you? I'd like to ask for your opinion regarding a programming obstacle I have. I have a ... A: I would do basically what you have done. However, arrays are known to be slow. Try using an ... | |
| jtextfield | 11/10/2007 |
| Q: sir,please help me with this: how to read text from a jtextfield and store i into a datafile? ... A: Sorry for the delay in answering. Overloaded at work. Try something like this: 1. Instanciate the ... | |
| jtextfield | 11/9/2007 |
| Q: sir,please help me with this: how to read text from a jtextfield and store i into a datafile? ... A: To get the text from a JTextField do this: String text = jTextField.getText(); What do you mean by ... | |
| puzzle | 11/8/2007 |
| Q: I mean, based on my code how to display the final stage 3x3 array to graphic? and can u help me to ... A: To display graphics you could use a pre built library such as JGoodies Animations ... | |
| question | 11/8/2007 |
| Q: u can access the private data out side of the class directly upto j2sdk1.4 but from jdk1.5 onwards ... A: As long as a variable is maked as private, it is only accessible to members/methods in its own ... | |
| puzzle | 11/6/2007 |
| Q: can u tell me why this code cannot work?? it said cannot find symbol. can u tell me what the ... A: Your problem is that you are calling the Puzzle constructor that has no arguments (which does not ... | |
| parse tree | 11/1/2007 |
| Q: i m writing program for parsing a sentence which output will be a parse tree......i have completed ... A: I don't know of any libraries that can easily help you do this. You may just have to use some of the ... | |
| java | 10/29/2007 |
| Q: we use JOptionPane.showMessageDialog( null, result, Comparison Result, ... A: As stated in the Java API, the first parameter: "parentComponent - determines the Frame in which ... | |
| File | 10/26/2007 |
| Q: I've visited some pages on File, but the difference between File and some contents like ... A: The answer is there in the Java API. File: An abstract representation of file and directory ... | |
| JAVA | 10/25/2007 |
| Q: I am working on fixing a website for my organization. Someone started and never finished the ... A: The problem is that the flash file "http://www.trentonems.com/logo.swf" cannot be found. Try copying ... | |
| java | 10/22/2007 |
| Q: now i can use the private function, do you thinks this code is right, any logic error? and i still ... A: The program looks ok. To print out the locations try this: public class Test { private boolean ... | |
| java | 10/21/2007 |
| Q: i am going to make a simple DFS, from the coding below, is it right? and can u help me if i want to ... A: Sorry but I'm not clear on what you need. Does this help? public class Test { public static void ... | |
| bout java class | 10/20/2007 |
| Q: Im a beginner to JAVA language and im using Netbeans 5.0(mobility),i had difficulty on how to make a ... A: Create your new class in Netbeans using the wizard. Specify the package, class name, etc. Then, in ... | |
| Beginnner question | 10/17/2007 |
| Q: I am a .NET guy and quite a good experience in .NET. I am planning to learn Java and want to have a ... A: In a perfect situation, things like form design, etc would be handled by a design department, ... | |
| bout java 3d api | 9/28/2007 |
| Q: im a beginner to java mobile and im using netbeans as my IDE ,im having difficulty of what JSR(184) ... A: The JSR 184 is a specification document that outlines guidelines and practices to be followed during ... | |
| Void Function | 9/26/2007 |
| Q: Hey Brian, I am just beginning to learn Java and was wondering how you would go about doing the ... A: It would help if you could post the code you have written so far. Here is an example. private int ... | |
| abt to start a project | 9/25/2007 |
| Q: sir i am abt to start my work upon a project which serves as a part of my college curriculam. but i ... A: Projects are never easy and you have little time to do one in. You should have allowed at least six ... | |
| Two-dimensional arrays | 9/24/2007 |
| Q: I'm trying to solve a problem and apparantely I can't think of a solution for one of the issues. I ... A: Say for example your matrix has numbers from 1 to 50. Get 10 random numbers using (Math.random() * ... | |
| Two-dimensional arrays | 9/24/2007 |
| Q: I'm trying to solve a problem and apparantely I can't think of a solution for one of the issues. I ... A: Here are some examples. // Get the number value (based on the loops) // and then convert // From ... | |
| using Java to control client side h/w | 9/20/2007 |
| Q: i hav a problem ..... how can i use jav code to control the h/w that is kept on the client ... A: I don't think you can control hardware remotely, at least not easily. You would have to do some ... | |
| getch() in java | 9/12/2007 |
| Q: "please could you tell me how to replace the c instruction getch() with something else in Java but ... A: There isn't a way. You can't count on every platform to support such. Some just have line mode ... | |
| Basic Lingo game return | 9/7/2007 |
| Q: Hey! Thanks for the reply. I started working on that basic lingo game problem that I had sent a ... A: Perhaps you could use a temporary file to store the string using createTempFile(String prefix, ... | |
| Java not working | 9/7/2007 |
| Q: I have the Java JSE runtime environment loaded in my programs. It does not initiate on its own or ... A: Sorry for the delay in answering. It sounds like something has corrupted your files. Try deleting ... | |
| Convert File data to Byte variable | 9/6/2007 |
| Q: I define variable as File like File dt = new File("enyrt.data"); then FileInputStream fis = new ... A: Try this: try { File dt = new File("enyrt.data"); FileInputStream fis = new ... | |
| null character | 9/1/2007 |
| Q: if the user enter a null character i want print a message invalid command, but i wrote some code for ... A: Try the following code. { System.out.println("Choose M to print main Menu"); choice = ... | |
| Upload the existing issue | 8/31/2007 |
| Q: I am working on a web application. I have a some issues regarding particular equipments. When the ... A: Use session tracking. Store each issue in some form of session tracking (cookie, etc). Then when you ... | |
| Questions on ObjectOutputStream.PutFields | 8/31/2007 |
| Q: saw the earlier answer of this subject but my code here still hit the same error: private static ... A: The java.io.NotActiveException is thrown when a classes writeObject method was not called to write ... | |
| Basic Lingo Game | 8/30/2007 |
| Q: Rules Lingo is a popular game show on the Game Show Network, with simple rules. Players are given ... A: This looks like a homework question. This a fairly long project which would require me to spend a ... | |
| Write into csv file | 8/29/2007 |
| Q: I want to write some data into a csv file fetched from the database using java. Can you please help ... A: There are many free java libraries that you can use to write to CSV. One of these is the Ostermiller ... | |
| bit representation | 8/26/2007 |
| Q: PLease can you give me a detailed explanation about why range of byte datatype is -128 to 127. Since ... A: All primitive types in Java are signed meaning they can be negative and positive. For bytes, there ... | |
| extract data from access database | 4/23/2007 |
| Q: How to extract data from Access Database and create a yahoo account. The code needs to be written in ... A: I have never done anything like this, but here is a very good library you can use to get data from ... | |
| gui vs logger question | 4/16/2007 |
| Q: I have a java app that has a GUI with a java.awt.textbox where I log steps of the application. This ... A: What you could do is include the code to write to the logger in the method that writes to the GUI. ... | |
| filtering | 4/16/2007 |
| Q: i need some help. now i'm develop a monitoring system with java. i want make a filtering to user ... A: You should dispose of the PreparedStatement, ResultSet and if necessary the Connection by setting ... | |
| gui vs logger question | 4/13/2007 |
| Q: I have a java app that has a GUI with a java.awt.textbox where I log steps of the application. This ... A: Your code is not too bad. It should write error messages to the text area. You might want to ... | |
| arrays | 4/4/2007 |
| Q: have a class and a program to use the class for an array blueprint. In the main, declared an array, ... A: You should include some code. It would aid me in helping you. Try this, when calling the method, ... | |
| package ff; importing.. | 4/4/2007 |
| Q: My question and problem of packages, that i had created called ff, which was asked to u, at last i ... A: Glad you found a solution. By the way, to always include the current working directory in your ... | |
| filtering | 4/3/2007 |
| Q: i need some help. now i'm develop a monitoring system with java. i want make a filtering to user ... A: Try something like this to query for a url that is in the database: boolean inDatabase = ... | |
| Java Windows | 4/3/2007 |
| Q: If the user clicks a menu and the link opens a window to google - then he wants to check his mail ... A: This is really a JavaScript question and you should post in the JavaScript location. However, the ... | |
| Java project | 3/30/2007 |
| Q: I am just writing to ask if you are familliar with arrays and methods. I have an assignment due, and ... A: Try the following: 1. To calculate the mean is simple, use the formula provided. 2. Same for std. ... | |
| java errors.. | 3/30/2007 |
| Q: i had created my own package called ff, and im unable to import the package in others program, i ... A: I would really advise you to sit down and read the Java documentation on use of "java.exe", ... | |
| doubt in exception | 3/28/2007 |
| Q: exception always throw at run time..but java have some compile time exception..then how it can throw ... A: Compile time exceptions/errors normally occur when code is written badly or is simply wrong. e.g. ... | |
| java errors.. | 3/27/2007 |
| Q: i had created my own package called ff, and im unable to import the package in others program, i ... A: If the folder in which your project files (.java) are located is called src (shor for source), then ... | |
| java errors.. | 3/26/2007 |
| Q: i had created my own package called ff, and im unable to import the package in others program, i ... A: To just include the class, you could place the .java file in a folder called ff inside your src ... | |
| background | 3/22/2007 |
| Q: I've created a 2D world in java but it has no background. I want to place a map on the background by ... A: Here is an example of a JPanel that can have an image as a background. You should be able to modify ... | |
| (GUI) question about action listeners | 3/22/2007 |
| Q: i made this code below and my question is, How do i make action listeners for each checkbox so i ... A: To write action listeners for a checkbox, try the following: 1. Add an item listener to the ... | |
| spell out numbers | 3/15/2007 |
| Q: Good day, sir. My professor asked us to write a program that lets us enter an integer and that will ... A: Try this: String num = Integer.toString(3245); char[] arr = num.toCharArray(); StringBuilder sb = ... | |
| how to write and run the following output? | 3/11/2007 |
| Q: if i ignore the method range(double[] x), how should i traverse the passed in array and select the ... A: You could use the Math.max(a, b) method and Math.min(a, b) method. You get the first two values of ... | |
| how to write and run the following output? | 3/10/2007 |
| Q: using method: static double range(double[] x) //returns difference between maximum&minimum //of the ... A: I have no reference for the method range(double[] x), so I am assuming that it should traverse the ... | |
| extracting records from my database(ms access) and display in gui format java swing.... | 3/7/2007 |
| Q: gud day expert.. i have a problem in my presently designed java swing program.i want to extract ... A: Here is some code that may help you: /** * Gets the DSN's from the user and system DSN lists. ... | |
| how to answer this question by java program | 3/6/2007 |
| Q: USE'SWITCH' AND 'BREAK' STATEMENT TO ANSWER THIS QUESTION. Many visitor would like to know the ... A: Pseudo-code: int age = getAgeFromSomewhere(); int option = -1; if(age > 54) { option = 1; } ... | |
| Java & Internet | 3/3/2007 |
| Q: I believe they send us the images in GIF, but I don't think it is downloaded onto my hard drive. ... A: Notepad has definately taken over opening the images. Try the following: Option 1: As before, ... | |
| Java & Internet | 3/1/2007 |
| Q: I have Java installed on my PC. I have Windows XP professional. I am registered to receive images ... A: It sounds like the settings in your computer have been changed so that the downloaded files are ... | |
| what is the wrong with following program | 2/28/2007 |
| Q: public class ShowErrors{ public static void main(String[] args){ for(inti=0;i<10;i++) ... A: According to the code you have posted, if you try to compile as is, the compilation will fail ... | |
| creating an IDE | 2/26/2007 |
| Q: sir, any other links regarding tutorials/links for creating a java ide. in sourceforge, I found ... A: What you need to do is download the source code for some of the IDE's on sourceforge. Look through ... | |
| creating an IDE | 2/24/2007 |
| Q: sir, I am planning to create a java IDE. I have read of ANT, XML,etc... . But one thing I was not ... A: Ant is mainly used in the build process to build Java apps, package and deploy them, etc. I would ... | |
| EasyQ | 2/24/2007 |
| Q: I'm new to programming. I Have a very important question, please you help me, Java has a lot of ... A: J2SE which is the core of Java is the most used part of Java. It contains all the basics, GUI ... | |
| Date Conversion | 2/23/2007 |
| Q: Hope u r doing good!! Can you tell me how to convert EEE MMM DD YYYY to yyyymmdd format in Java.. ... A: Assuming that you want to get a String representation of the Date, try this: /** * Converts a date ... | |
| slideshow | 2/21/2007 |
| Q: I've been working on an image viewer/editor for the last couple weeks. Now I want to add a slide ... A: I am assuming that "selectedFiles" is a File array. Bear in mind that listFiles returns an array of ... | |
| arrayList | 2/20/2007 |
| Q: I need the following code to firstly look at a value that is stored within a combo box, take this ... A: Problem 1: In the line String numIndex = (string) cboSelectFilms.getSelectedIndex(); you need to ... | |
| I/O Stream | 2/18/2007 |
| Q: Both read() of InputStream and read() of character stream return char's int format, so what are the ... A: InputStream is used to read a stream of byte of data. The data is commonly read into a byte buffer ... | |
| JAVA limitations? | 2/18/2007 |
| Q: I am running a programme written in JAVA or JavaScript that runs perfectly in the early stages of ... A: Java is not limited, but the Java version you are using most certainly is. One major problem is ... | |
| TypeCasting | 2/11/2007 |
| Q: Please explore the Basic concepts of Typecasting and TypeCasting of objects. A: The rules for reference conversions (conversions that the compiler will not throw out) that can be ... | |
| I/O Streams | 2/11/2007 |
| Q: As we know InputStream is an abstract class so what is the class of "System.in" object? A: The System class automatically creates a standard input, standard output, and standard error output ... | |
| how to use putFields() and getFields() | 2/8/2007 |
| Q: I'm trying to store objects on the file to retrieve them back i want some field.I tried to do so by ... A: First of all, only objects that implement the java.io.Serializable interface can be serialized with ... | |
| arraylists and vectors' methods | 2/5/2007 |
| Q: i have a simple question whenever i create an arraylist or vector and use its add() method (in the ... A: You get that message because you are not using Generics in your code. There is a basic tutorial on ... | |
| MultiThreading | 2/3/2007 |
| Q: Why have wait() and notify() methods been defined in Object class not in Thread class?Why we do not ... A: These methods are defined in the Object class so that all classes which are created have these ... | |
| hai | 1/22/2007 |
| Q: i want the source code of the cryptography using the RSA algorithm in java? A: Here is an example of RSA encryption. ------------------------------------- LAYNETWORKS.COM posted ... | |
| java | 1/19/2007 |
| Q: how to fetch resume from excel spreadsheet and put it in ms-access please give code A: You can use the following the resources to read and write excel files. ... | |
| Java J2SE GUI & JDBC | 1/19/2007 |
| Q: (1) Drag&DropTargetListener -----> To drag an object (label) and drop in the empty panel. ... A: You can modify the following code to do what you want. /** * Drop event. Used to open ... | |
| Java coding | 1/18/2007 |
| Q: i need a Java code for a non functional calculator interface A: Here is the main class from a calculator app that I built some time ago. I have removed the ... | |
| components in swing | 1/7/2007 |
| Q: i have a simple question how do you remove a component (such as a button or even a panel) from ... A: To remove a component from a JFrame or JPanel, use the remove(Component comp) or remove(int) methods ... | |
| core java+static methods | 1/1/2007 |
| Q: could i have the reason of it that we cannot directly call the non static methods in static methods. ... A: Non-static methods are associated with an instance of the class. They typically operate on state ... | |
| Java Fundamentals | 12/24/2006 |
| Q: I've got an exam coming up and i need help on the following categories. Please explain in detail and ... A: To answer answer all of your questions in detail would take a lot of time. Here are some quick ... | |
| Help!! | 12/21/2006 |
| Q: 1.What is a constructor and why is it important? Is it possible to write a java code without a ... A: 1. A constructor is where you would call important code that needs to be set up before using the ... | |
| Generics and Type Erasure problem. | 12/17/2006 |
| Q: I've tried searching the web for 2 days without answer. I have a ApplicationHelper.java that ... A: I have faced the same problem in JDK 5 with generics. Unfortunately, I had to play around a little ... | |
| Here is the code | 12/10/2006 |
| Q: package airlineticketcost2; /** * <p>Title: airlineTicketCost2</p> * * <p>Description: </p> * ... A: Can't compile the code. Need the 'Business' and 'First' classes. Could you post it? I have gone ... | |
| SCJP | 12/8/2006 |
| Q: QUESTION NO 111 Given: 1. public class Foo { 2. private int val; 3. public foo(int v) (val = v;) } ... A: Q111 A because a is a new Foo object and c points at that object. i.e. both a and c point to the ... | |
| SCJP | 12/8/2006 |
| Q: QUESTION NO: 97 Exhibit: 1. public class X { 2. public static void main (String[]args) { 3. int [] a ... A: Q97 B because int[] arrays are automatically initialized on creation with a value of 0 which is ... | |
| SCJP | 12/8/2006 |
| Q: QUESTION NO: 92 Given: 1. String foo = blue; 2. Boolean[]bar = new Boolean [1]; 3. if (bar[0]) { ... A: Q92 bar[0] is an object. You need to get the boolean value for it be correct ... | |
| SCJP | 12/8/2006 |
| Q: QUESTION NO: 79 Exhibit: 1. class super { 2. public int getLength() {return 4;} 3. } 4. 5. public ... A: Q79 E because overriding method should return int at line 6 Q87 C because you want to get the ... | |
| Java | 12/8/2006 |
| Q: Problem with if statement. Why does the reservation fee still showing $20.00 when I don not want a ... A: I think you mean in the public static double reservationFee() method? The code looks ok and should ... | |
| SCJP | 12/5/2006 |
| Q: Question No: 6 Exhibit: 20. Public class test ( 21. Public static void stringReplace (String text) ( ... A: Neither stringReplace nor bufferReplace return anything. So, whatever is passed in to these methods, ... | |
| SCJP | 12/4/2006 |
| Q: QUESTION NO: 113 Given: 1. public class SyncTest { 2. private int x; 3. private int y; 4. private ... A: This is because the methods are not fully synchronized. At some point class P can call setXY and the ... | |
| SCJP | 12/1/2006 |
| Q: QUESTION 66 Given: 1. class A { 2. } 3. class Alpha { 4. private A myA = new A(); 5. 6. void dolt( A ... A: B because none of the other methods are called and thus if myA is set to null, it is not ... | |
| Why is this applet not working for some people but working for others? | 12/1/2006 |
| Q: This applet works for me, and many others, but some people have complained that it doesn't work for ... A: I looked at the applet myself and had no problems. I did notice that it is fairly large and on ... | |
| SCJP | 11/30/2006 |
| Q: QUESTION 27 Given: 1. public class SwitchTest { 2. public static void main(String[] args) { 3. ... A: See my comments in the code for the explanation: 1. public class SwitchTest { 2. public static void ... | |
| SCJP | 11/30/2006 |
| Q: QUESTION 16 Given: 1. public class Delta { 2. static boolean foo(char c) { 3. System.out.print(c); ... A: The answer lies in how a for loop is executed. 1. Enter the loop, look at initial value, print A 2. ... | |
| SCJPJAVA | 11/30/2006 |
| Q: QUESTION 4 Given: 1. class Test { 2. private Demo d; 3. void start() { 4. d = new Demo(); 5. ... A: E because the demo object still exists at line 10. It is set to null at line 9, but then immediately ... | |
| SCJPJAVA | 11/29/2006 |
| Q: QUESTION 25 Given: 1. class TestSuper { 2. TestSuper(int i) { } 3. } 4. class TestSub extends ... A: Compilation fails because when line 7 is called, it calls the default constructor of the TestSub ... | |
| Don't know why I'm getting a null pointer exception | 11/28/2006 |
| Q: I'm teaching myself Java and I'm trying to use an array of objects I created but I'm getting a null ... A: When I instantiate an array of objects doesn't that instantiate each object of the array? -> No it ... | |
| Jtext area | 11/27/2006 |
| Q: how do i write a program which will generate random numbers from 1-5,the user will have to guess ... A: Use Math.random() to generate the random numbers. The number the user enters is stored in a ... | |
| Mozilla browser is Stateless ? | 11/23/2006 |
| Q: Is Mozilla browser is stateless ? Means When we close the MS Internet Explorer it doesnot remeber ... A: I think what you are trying to do may work better with cookies. Some browser simple will not allow a ... | |
| Query on JSP with Javabeans | 11/22/2006 |
| Q: I am Sunil, I have one query.How to get multiple values from jsp using javabeans class. For ... A: Is not possible to simple declare an array in you code? e.g. public class StudentBean implements ... | |
| Request by code | 11/22/2006 |
| Q: I'm working on an application development whose main function is act like a filter to the request ... A: I think your question is a little out of my league. I will give it a try though. From what I can ... | |
| how to access data site that use ActiveX controls | 11/22/2006 |
| Q: I want to pull data from a web site that is heavily using Ms-ActiveX controls. How can i do this ... A: I'm not really sure how (or why) you would want to do this. You might try writing a program that can ... | |
| Java (RS) hacking | 11/19/2006 |
| Q: So i have read one question about hacking into runescae adn read the answer that states that the ... A: I don't normally answer questions about Runescape. To answer your questions though, 1. People are ... | |
| java,servlets | 11/16/2006 |
| Q: what is garbagecollector?how can we use this?where can we use?is it gc already builtin or not?what ... A: The java garbage collecter runs automatically once in a while to free up memory that is no longer ... | |
| java class | 11/13/2006 |
| Q: I have written a class in Java. I would like to run this class in a browser. Can you tell me what ... A: In order for your class to run in a browser, you must write it as a Java applet. This is done by ... | |
| Stackoverflow error | 11/11/2006 |
| Q: I have a connectivity problem where I have to select a number of vertices(N) and connect them with ... A: StackOverflowErrors are commonly caused by your program running out of memory. See some of my ... | |
| Not sure | 11/10/2006 |
| Q: I think I have a Java related problem but I'm not sure. It's simple - I can't seem to attach files ... A: I can't really answer your question without more information. For example, 1. What email client are ... | |
| stack overflow error | 11/9/2006 |
| Q: could you tell me why does this sudoku-solver ends up with stack over flow what ever matrix user ... A: Stack overflow errors are usually cause by method that are recursive. These method call themselves ... | |
| placing image icon on a 3D cube | 11/3/2006 |
| Q: sorry to trouble you again, while waiting for your reply, i have face another problem where i dont ... A: Sorry for the delay in getting back to you. Unfortunately, I still cant build your code. package ... | |
| jsf internationalization in arabic | 11/1/2006 |
| Q: hai, i new to jsf.but the project must support arabic language in j2ee platform.i stored the arabic ... A: I have tried doing some research on your problem. Most people say that you should use native2ascii ... | |
| java Networking | 10/31/2006 |
| Q: Please i need help..i want to create Desktop chatting Application with java that [Work on ... A: You need to build aclient side program and a server side program. No special API is necessary. Here ... | |
| jsf internationalization in arabic | 10/31/2006 |
| Q: hai, i new to jsf.but the project must support arabic language in j2ee platform.i stored the arabic ... A: First of all, make sure that you have the required fonts installed on your computer to display ... | |
| array binarytree | 10/25/2006 |
| Q: I'm trying to convert linked representation of a binary tree to its array format, but I'm having ... A: What if you first add the array elements to a Vector for example, and then copy these to an array? ... | |
| object oriented programming | 10/24/2006 |
| Q: i am asked to write a method using Java to compare two objects or inputs from the user using ... A: Here is an example: int compareTo(String s) - returns a negative value if the String is "less ... | |
| java 3D | 10/23/2006 |
| Q: Thx for the links. Sorry but to ask you one problem that i haven encounter. I try importing the 3D ... A: Make sure the JAR file containing the classes is in your build path. You can use the -cp or ... | |
| While loop prime numbers problem | 10/23/2006 |
| Q: How to determine if its a prime number or not in a while loop problem A: //Try this public class PrimeNumberTest { public static void main(String[] args) { int ... | |
| java 3D | 10/19/2006 |
| Q: i am sorry to trouble you again, my supervisor assign me a new task. My task is to zoom in a certain ... A: I don't have time at the moment to write out any code as I am very busy at work. Here are a few ... | |
| java says it needs to be enabled | 10/18/2006 |
| Q: i hope you can help me.. ive used Java for a long time and never had any problems with it until now. ... A: First check if Java is installed properly. Do the following: 1. Open command prompt or a terminal. ... | |
| java 3D | 10/16/2006 |
| Q: i am doing a project on java 2D and 3D. I have finished the 2D portion and proceeding to do the 3D ... A: Here is a sequence of steps you could follow to zoom: 1. Take your image and make a BufferedImage ... | |
| About java reference | 10/13/2006 |
| Q: im starting to progam in java especially in mobile using netbeans 5.0,can you give the list or ... A: The netbeans mobility download page has a number of links to tutorials and articles.Check ... | |
| Java | 10/11/2006 |
| Q: how to get console window(as we get in .net when run the console application)as we run a java ... A: When running a Java program, the command prompt is normally displayed. This is always the case. ... | |
| Executing a java program from another directory | 10/2/2006 |
| Q: Sir, My problem is: I have one java program in the current directory "C:\Current" by name ... A: For your first problem, you might try passing the run command as a complete string to the exec ... | |
| asking for tutorials | 10/2/2006 |
| Q: im a programmer but of different language,im reading right now about mobile application in Java ... A: As far as tutorials about mobile application programming with Java are concerned, a Google search ... | |
| Change the design interface of the JButton | 10/2/2006 |
| Q: i have a question regarding JButton. Is that any way that i can use coding to change the interface ... A: You can change the way a JButton looks by extending the JButton class. You can make the button ... | |
| create a jar file using JCreator | 10/1/2006 |
| Q: I am using JCreator to write my program and I want to create a jar file so I can run it on any ... A: I don't personally use JCreator so I'm not so familiar with it. I did download it have a quick look ... | |
| simple java application program | 10/1/2006 |
| Q: Gud day Mr. Brian Ngure!!! we are assigned and given (in a class) a simple java program to ... A: I don't give full answers for this type of question (because that would be doing your homework for ... | |
| graphics | 9/26/2006 |
| Q: i would like to create two circles that appear randomly on a window and every time they overlap a ... A: Use the drawOval(int x, int y, int width, int height) method in the Graphics class to draw your ... | |
| difference between .eqauls() method and == operator | 9/21/2006 |
| Q: equals() method and == operator in java, im quite confused regarding these two when use what, can u ... A: This is something which confuses a lot of Java programmers. equals() is a special method that ... | |
| Executing a java program through another using Runtime.getRuntime.exec() | 9/18/2006 |
| Q: Sir, can u tell me how to ececute a java program which is already compiled using another java ... A: You need to do something like this: public class Using { public static void main(String ... | |
| problem with opera | 9/7/2006 |
| Q: really its good of having this site. coming to question i developed program its working fine in ... A: It is well documented that Opera does not fire load and unload events. I have not been able to find ... | |
| How to get data from another Frame | 9/4/2006 |
| Q: I have 2 Frames in second I select an item from JList. How in first frame to display witch item was ... A: In your second frame, you need to add a ListSelectionListener to your JList like this: ... | |
| Returning from a while loop | 8/30/2006 |
| Q: I have another question I'm hoping you can clear up for me. I have written a method that has a ... A: Glad to help. To answer your question, no you do not need to do anything else. Here is why: When ... | |
| application memory space | 8/30/2006 |
| Q: I have three questions about application memory management, 1.does an application run within its ... A: Memory management in Java is handled by the JVM. To answer your questions: 1. Does an application ... | |
| Java switch statements | 8/29/2006 |
| Q: I'm hoping you can help me. I could have sworn it was possible to write Java switch statements ... A: What you want is called "falling through". This happens when you do not include the break statement. ... | |
| signed applet certificate | 8/28/2006 |
| Q: i signed my applet and i got six months free certificate,but now my problem is can i get certificate ... A: In order to extend the time the signature is valid, you need to specify the time in the keytool ... | |
| signed applet certificate | 8/28/2006 |
| Q: i signed my applet and i got six months free certificate,but now my problem is can i get certificate ... A: Did you sign the applet using a certified authority (e.g. Thawte) or did you generate the signature ... | |
| MouseInputListener | 8/24/2006 |
| Q: I have problem I've searched on a whole day. I have a class called ToiletLabel and it is an ... A: Sorry for the delay in answering. I have had a quick look at your code and while it seems to ok and ... | |
| getting images dinamically | 8/24/2006 |
| Q: iam new to core java can u plz tell me how to get images dinamically, means i want all the images ... A: If you would really like me to write out some code for you, I suppose I could. This will take a bit ... | |
| getting images from remote machine using applets | 8/23/2006 |
| Q: iam woring in larsen and toubro mysore,india. iam new to core java. in my project i compleated ... A: 1. Can we communicate with other pc using applets? Not really. Java applets must run in a "sandbox" ... | |
| retriving images from server dinamically | 8/22/2006 |
| Q: my name is krishna kanth working in larsen and toubro ltd ,Mysore. i am new to java my question is ... A: One method you may try is to use a reuseable image servlet. Here is a basic example. JSF ... | |
| INT expression | 8/8/2006 |
| Q: Why the expression involving int or smaller data type is always an int in Java ? Example : byte a ... A: This happens because Java has certain automatic casts and checks it performs. In your example, the ... | |
| Static method override | 8/8/2006 |
| Q: Why static method can't be overridden in Java ? A: Static means one per class, not one for each object no matter how many instance of a class might ... | |
| Import statement in Java | 8/8/2006 |
| Q: why import statement is introduced in Java ? Since the CLASSPATH shows the directory for all ... A: Sorry for delay, problems with connection. Import statements are needed because of the package ... | |
| Outputting Text into a JPanel in Java | 7/26/2006 |
| Q: I am designing and coding a sharable calendar with a client-server relationship. I am trying to ... A: First of all, it is not possible to actually add text directly to a JPanel. You need to add the text ... | |
| java | 7/21/2006 |
| Q: I am having a String object s= "7/21/06"; i want ot change the string object to date object. ... A: You need to format your Date using the java.text.DateFormat class. e.g. DateFormat df = ... | |
| java packages | 7/17/2006 |
| Q: Is the system varialbe name JAVA_HOME, PATH, or CLASSPATH?How do I set my classpath to include ... A: There should be at least two of these defined in your system variables under "My Computer". All ... | |
| java packages | 7/17/2006 |
| Q: How do I set my classpath to include packages? For example if I want to create a gui with Netbeans ... A: There are a number of ways to include packages in your classpath. If you are using Netbeans, do the ... | |
| Java Program distribution | 7/14/2006 |
| Q: How do I distribute my finished product (Java program)? If I use the JFreeChart and Jexcelapi to ... A: To distribute a java program, you can create a java installer for it using one of the many free ... | |
| Java Excel | 7/14/2006 |
| Q: What do I use or how do I write and parse Excel with Java? Also, how do I install java packages, ... A: There are a number of open source libraries that you can use to write and parse Excel documents ... | |
| running time problem | 7/13/2006 |
| Q: I did what you instructed to do. but, when I do >java -version java version "1.4.2_03" Java(TM) 2 ... A: Ok. First, it would be wise to uninstall the JDK version 1.4. It is redundant and just clogs up your ... | |
| running time problem | 7/13/2006 |
| Q: How can I install JRE 1.4 and set the JAVA_HOME path?I just started on java and wrote the ... A: To install, download the latest JDK version from http://java.sun.com (I think it is version ... | |
| running time problem | 7/13/2006 |
| Q: I just started on java and wrote the helloworld.java program. It compiled fine. Now, when I run the ... A: java.lang.UnsupportedClassVersionError: Ch2Birthdate (Unsupported major.minor version 49.0) This is ... | |
| JAVA | 7/8/2006 |
| Q: I created a form with a button in java. How can I open an application e.g. (Microsoft calculator) ... A: This is a quick answer to your question. Play around with it and you could add more functionality. ... | |
| i cant uninstall Java | 6/26/2006 |
| Q: my name is Aaron. I am having trouble uninstalling Java. When i got to Control Panel and clicked Add ... A: You could try download the full Java installation and install it (do not install from the net), then ... | |
| How to Print a Simple Text File in Java? | 6/24/2006 |
| Q: I have a question. I am developing an application where i want to print a simple text file in Java. ... A: There are many ways to print a text file in Java. If you have the JDK 6.0, this functionality has ... | |
| Java Superposition of Waves | 6/10/2006 |
| Q: I have chosen to take on a project for my physics teacher that involves calculating the ... A: I have had a quick look at your code. The best advice I can give here is to look at some of the ... | |
Java
Answers by Expert:
Brian Ngure
Top Expert on this page
Expertise
Strong in Java. Will be able to answer both in areas of designing and coding. Some knowledge in servlets
Experience
5 years of Java experience, Sun Certified Java Associate and Sun Certified Java Programmer, JDK 1.4
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