I have a program that I want to draw different graphics depending on which
button is pressed.
I have set up all of the GUI and the ActionListeners for the buttons but I'm
not sure how to draw the graphics without having to use the method:

I ahve this map of a musem:
7 --   EXIT(8)  -- 3
 |             |            |
6   --      4    --    2

 I'm a relative newcomer to Java and I was wondering if there any good
numerical libraries (on the lines of GSL for C) available? Specifically
I'm looking for linear algebra routines, least squares and minimization
routines.  I'm interested mainly in Opensource libraries but I am ...

I come from a background of Unix C-shell, WIN .bat programming and am
entirely new to the concepts of Object-Oriented programming.
I'm having a hard time geting the concept of 'objects', 'classes',
'why to use them', 'when to use them' etc. I have bought couple of

I have written my first applet ( actually copied it from a book)
// <applet code="Message.class" width=200 height=100> </applet>
public class Message extends javax.swing.JApplet {
   public void paint(java.awt.Graphics g) {

Somebody knows where can I find a java applet code that implements
arithmetic and logical operations with images.
I need a realy easy code because I never have programed in visual Java.
I allready searched in the Internet but I haven't found anything.

I have a file, HelloWorld.class, as follows:
public class HelloWorld{
  public static void main(String args[]){
       System.out.println("Hello World\n");

How to convert an array of object Long to array of primitive long?
Long[] to long[]?
Tx.

Here is a Java program to score any objective test:
http://www.psychology.org/cgi-bin/links2/jump.cgi?ID=3913
(see this site for details on all I describe below)
Problem is, this (and all similar programs wanting people to copy

import java.io.*;
import java.net.*;
import java.awt.*;
import java.util.*;

"The existing J2SE v1.4.2 installation is corrupted. Please uninstall J2SE
v1.4.2 and restart this installer."
This is the message I get when trying to install the package.
Because of problems I previously tried to uninstall J2SE during wich the

I am  putting together a program that reads a csv file, and stuffs it into a
database.
I want a progress bar to display as the csv file is being read in.
the way i have done this is to extend the JDialog class, with a routine that

I'm using JPanel.
How can I use the raised model of JPanel?
Many thanks