36,051 Topics
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| | Why is this code not working???? [CODE] <c:if test ="${sessionScope.qCounter == 0}"> <!-- {((Quiz1) (sessionScope.quizVal)).correctAnswer(sessionScope.boxval)) == 'true'}">!--> <br><font size='3' color = 'red'>Your last answer was not correct! Please try again!!</font><br> </c:if>[/CODE] qCounter and quizVal are a session scope attributes I declared like . [CODE] HttpSession s = request.getSession(); s.setAttribute("quiz", new …  |
| | Hi everyone, I am using Ubuntu 7.10, and I have Java and MySQL installed with the command line as follow: 1. sudo apt-get install sun-java6-jdk 2. sudo apt-get install mysql-server and my JAVA and MySQL are working well, but now I want create connection between JAVA application and MySQL using …  |
| | Hi, I have been working on a ScrollPane and I need to increase the increments (when you press the up and down arrow), and also make it respond to a mouse scroll wheel. The code I have (one screen in a CardLayout) is: [CODE]public void instructions () { resize (800, …  |
| | hi, looking at this example code: [CODE] public void writeList() { PrintWriter out = null; try { System.out.println("Entering try statement"); out = new PrintWriter( new FileWriter("OutFile.txt")); for (int i = 0; i < SIZE; i++) out.println("Value at: " + i + " = " + vector.elementAt(i)); } catch (ArrayIndexOutOfBoundsException e) …  |
| | how to avoid validation summary when required field validator is disabled..i am disabling required filed validator from java script...eventhough i disabled it ...error message is shown in validation summary. I am facing the error... Explain how to go ahead ... i need to go ahead with jsp, javascript, not with … |
| | [CODE] import java.awt.*; import java.awt.geom.*; import java.awt.event.*; import java.applet.*; import javax.swing.*; //need this for the timer to work. ///public class DoubleBuffering extends Applet implements MouseMotionListener class Ship { private int xpos, ypos, height, width, speed, xdir, ydir; private Ellipse2D.Double c; public Ship(int x, int y, int w, int h, int … |
| | For those who understand El Gamal signature scheme . U may have known the verification process of the signature : y^a *a^b (mod p ) = g^M (mod p) We have to compute both side of the equation. If they are equal, the signature is verified. but i have issue … |
| | I am new to java, taking an intro to java class, my grade is on the border line, need major help! I'm having a lot of trouble getting this program to work. I have written the entire program, but clueless of how to overcome these errors; program needs 2 be … |
| | write a program that computes the nth root of a number. given a real number X greater than 1 and less than -1 and given an integer Y, compute the nth root Z such that Z*Z*Z*Z*Z*Z*Z...(Y times)..Z*Z=X, or Z^y=X(Remember if X is negative Y must be odd.) The user enters … |
| | I have two questions that are Eclipse and Mac OS X specific. Question 1: Referring to eclipse preferences > java > Installed JRE's > Execution Environment: Can someone explain the [ execution environment's ] and compatible [ JRE's ]? I'm interpretting this as the execution environment being the JVM eclipse … |
| | Hi, I have been making a checkbook program for my final project. When I run my program and try to read a file into my array, it is giving me this error: Exception in thread "main" java.lang.NullPointerException It is pointing to this specific line: balance = myRegister.alterRegister(checkBook[i].getAmount()); I'm not sure …  |
| | Hello Can someone get me started in the effert to fix this SQL statement to be excepted to create a table in a derby embeded db? [code] public boolean createTables(Connection conn) throws FileNotFoundException, IOException { System.out.println("in createTables:"); boolean createdTables = false; Statement stmt=null; try { String thisTable=ModelUtils.getXMLResource("createAdminTable"); System.out.println("thisTable sql String: … |
| | I've got this applet to build with no errors but then I try to run it and when I click the button in the applet, nothing happens...at least, not in the applet. Instead, jGRASP gives me all this stuff and I don't understand a bit of it: ----jGRASP exec: appletviewer … |
| | My program complies fine but whenever I run it the applet loads but its blank and at the bottom it gives me Applet Not Initialized. I have no idea whats causing this if someone could help me out would be greatly appreciated. The Errors im getting are: [QUOTE] at javax.swing.ImageIcon.(init)(ImageIcon.java:167) … |
| | I followed a tutorial and built my own little program but get this message: Exception in thread "main" java.lang.NullPointerException at javax.swing.ImageIcon.<init>(Unknown Source) at Gui.<init>(Gui.java:27) at appls.main(appls.java:6) What to do? Here is my code btw [CODE]import java.awt.FlowLayout; import java.awt.event.ActionListener; import java.awt.event.ActionEvent; import javax.swing.JFrame; import javax.swing.JButton; import javax.swing.Icon; import javax.swing.ImageIcon; import javax.swing.JOptionPane; … |
| | i am facing problem while taking input via...JOptionPane.showInputDialog()....plz tell me what package i have to import for it.....:rolleyes: |
| | Hello, I am making a program that calculates factorial and summation. I ask the user what they would like to do, then ask them to enter a whole number. The program I wrote has loops, so if the user wants to do this again, they can. When I do the … |
| | ok, so i have a problem to do in java that i just can't seem to figure out. here is the problem: Write a Java program that prompts the user for how many individuals they will be entering. Then program will then prompts for each individuals name and account balance. … |
| | Hello everyone I want to run a .jar file, but the only way to run in my computer is with the "java -jar file.jar ", but the problem is that the application conects to a mysqldatabase, when I want to add something in the program appear a message that say … |
 | [CODE]File tempFile = new File(fw.getAbsolutePath() + ".tmp"); BufferedReader br = new BufferedReader(new FileReader(fw)); PrintWriter p = new PrintWriter(new FileWriter(tempFile)); String serData=(String)loadService().elementAt(i); StringTokenizer st = new StringTokenizer(serData, ":"); String code=st.nextToken(); String name=st.nextToken(); if (!name.trim().equals(deleteString)) { p.println(st); p.flush(); } p.close(); br.close(); if (!fw.delete()) { System.out.println("Could not delete file"); return; } //Rename the … |
| | Hi I am doing a lab where I have to print out all of the locales when the JButton is pressed but when I run the program all it does is show the Vietnamese locale anyone any suggestions how to show them ALL ? [CODE] import java.awt.*; import javax.swing.*; import … |
| | [B] I have this method:[/B] [code] static int countLeaves(BinaryNode node) { if (node == null) { return 0; } else if (node.left == null && node.right == null) { return 1; } return countLeaves(node.left) + countLeaves(node.right); } [/code] and i want to Write a client program that constructs a binary … |
| | Hi, I want to make a game that I saw in internet but via applet code (and with move counter). The game is [URL="http://leepoint.net/notes-java/examples/games/slidepuzzle/slidepuzzle.html"]http://leepoint.net/notes-java/examples/games/slidepuzzle/slidepuzzle.html[/URL] Could someone help me please ??? |
| | Hello, i tried too long so i describe my problem here. im really desprate. I want to link from JSP1.jsp to JSP2.jsp with a simple <a href=...> statement This link should also have an identification number. this is my JSP1.jsp: [CODE] <%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%> <!DOCTYPE html PUBLIC …  |
| | I want view web page by http connection in j2me but the output is html code if any one can help me please replay |
| | I'm trying to convert from some Java code, and I've got one massively complicated headache. Bear with me while I see if I can provide a comprehensible explanation. Let's suppose I have an abstract class called BaseDatatype. Other classes will inherit from this, e.g. StringDatatype, NumericDatatype and so on. Now, …  |
| | Hi All, I am writing jsp to export data in excel format to user. An excel could be recieved on the cient side. However, since there's large amount of data, and I don't want to keep it in the server memory and write them at the end. I try to … |
| | I've gotten this applet to do some of what it should but I'm having trouble getting it to do the rest. It's a multiplication applet that asks the user a question such as "What is 6 times 7?", has a JTextField for the user's answer, and a JButton to check … |
| | Hi Everybody, I'm currently doing a Computer Science IB course in which I'm required to create a java program of my choice. I'm quite new to java but i still chose something i thought would be cool and it turned out to be a little harder than i thought. As … |
| | Hi All, Im Thiyagu, a junior software developer(Java/J2ee). I have assigned to access Webservice (sending request and receiving response from a WSDL). can any tell me the steps involved to convert Java code from a WSDL file using Axis(with ant build script). please very urgent. Note : I already tried … |
| | this project is to determine if a phone number is a prime number. if the number is a prime number then print a message to the effect. if the number is not a prime number then print the prime factors of the number. allow the user to continue entering numbers … |
| | I'm writing a program that reads information from three seperate classes. Here is my code: [CODE] public class Animal { protected int id; protected String type; protected double mass; //------------------------------------------------------------------------ // Sets up an animal with the specified ID number, type and weight. //------------------------------------------------------------------------ public Animal (int animalID, String animalType, … |
| | I am working on an assignment where I am to create a mortgage calculator that allows the user to input there mortgage amount, term and interest rate. The following is what I have so far. The errors I keep coming up with are the following: The Decimal Format the for … |
| | Hi All, I have developed a web application using jps. I have a user pages, which can be accessed after entering login credentials. If a user tries to go the a certain page directly without logging in, it directs to login page, this works perfectly in all browsers except mozilla. … |
| | Sever.java file [CODE]import java.net.*; import java.io.*; import java.util.*; /** * Simple server use to teach University of * Northumbria's Operating Systems and Networks modules. * To be used with compatible simple client. * <PRE> * Protocol: * client <---message--- server * message = <message body> CRLF * </PRE> * * … |
| | Hi I am trying to design a chat room using netbeans, I have been able to get 1 client to communicate with the server..please how do I create multiple clients and then enable them to broadcast messages to all other clients using UDP. My codes are below: [code]package MobileServer; import … |
| | Hi, I'm having a hard time getting my applet to even build right. Here are the instructions my instructor gave: [I]"Develop a Java applet that will help an elementary school student learn multiplication. Use the Math.random method or a Random object to produce two positive one-digit integers. The program should … |
| | I need to do the following program, but it need to have a do while loop, scanner for input, and a console program. Here are the instructions: Write a Java program that prompts the user for how many individuals they will be entering. Then program will then prompts for each …  |
| | java.awt.*; import javax.swing.*; import java.awt.event.*; class Getaction implements ActionListener{ String am = ""; String req ; String em = ""; String oper = ""; double x,y ,result; String res; Addcomp get = new Addcomp(); public void actionPerformed(ActionEvent ev){ req = ev.getActionCommand(); if((req.equals("1")) ||(req.equals("2"))||(req.equals("3"))||(req.equals("4"))||(req.equals("5")) ||(req.equals("7"))|| (req.equals("8"))||( req.equals("9")) ){ if (oper == … |
| | hallo guys.i am newbie at java and i want ur help. i have created the 5 five buttons but not the action listeners for them. the five buttons are : add person, see ll persons, search a person,update a person, delete person.so when i press add person the programm should … |
| | Hi All, I am working on Digitally Sign XML and managed to do it. The problem is that the code is automatically picking up one of the key and signing the XML with that. I want that user gets a drop down which has list of all the installed DSA … |
| | I want to add a chat room for my web site,I have used jsp/servlet technology to develop my site, I have heard that like "jaxter" or something, I don't know how to spell it. Appreciate if someone can help me for this. |
| | Hi, I'm having a hard time getting my applet to even build right. Here are the instructions my instructor gave: [I]"Develop a Java applet that will help an elementary school student learn multiplication. Use the Math.random method or a Random object to produce two positive one-digit integers. The program should … |
| | [code] Statement statement = connection.createStatement(); String frmdate = request.getParameter("date1"); String todate = request.getParameter("date2"); SimpleDateFormat df = new SimpleDateFormat("DD/MM/YYYY"); //Date frmdate = df.parse("strdate1"); //Date todate = df.parse("strdate2"); try { // java.util.Date date3 = df.parse(frmdate); // java.util.Date date4 = df.parse(todate); java.util.Date ufdate1 = df.parse(frmdate); java.util.Date utdate2 = df.parse(todate); java.sql.Date fs1 = new … |
| | I have spent over a WEEK trying to figure out why my code isn't working. It's a long code, I will post it all but I will break down the code as I explain. First off, I have called double[] arrays and then initialized them later on in the program … |
| | I am making Tetris in Java. I have the Grid as its own class (extends JPanel) a menu bar (also extends JPanel) and a class for the main game window (extends JFrame). I created instances of the Grid and the menu bar inside the main game window class and added … |
| | my teacher wants the tictactoe game to have a button called play that resets the tictactoe game my button doesn't work....what did i do wrong? [CODE] //TicTacToePanel.java Author Carien Anderson //Represents tic tac toe game board and allows peer to peer competition import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.JOptionPane; … |
| | I have this 2d array that sorts the rows but i can't sort the column.. i can't figure it out for the life of me. PLEASE HELP Please enter size of row between 1 - 20: 5 Please enter size of column between 1 - 20: 5 Your matrix is … |
| | Hi i'm a new student in java and would appreciate anyone helping me get through. I do not want you to do my work because that won't help me get through the next and next assignments however I would appreciate your help putting me on the right track such as … |
| | Hi All, How to store the resultset value in a array? I have a field "prodvalue" in DB Table, now i want to store this "prodvalue" in array. Am able to print the values of "prodvale" in jsp, but not able to store in array. Pl. find below the code, … |
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