Okay, thanks for that, that was a stupid mistake, lol, I have not really got any experience with C++. I'm compiling it from the terminal window with g++ instead now.

If you don't mind, I have a...

Hi everyone, I'm new to C and have been given a C program to complete but found it includes many versions of the titled error for each class file.

Can anyone please explain why it occurs and how I...

Sorry...Null Pointer Exception - Exception in thread "main"

I'm not sure if I'm doing this correctly but up to now I get an exception error. Can you see why? :



public void countHeap(){
System.out.println("input data:");
for (int i = 0; i <...

Thanks for the input, I really appeciate it although I have kept the same vector I already have and used your for vector method which was really beneficial; the canvas now paints more than one...

Hi all,

Background:
I am dealing with graphical objects on a canvas in which the user draws four lines and out of these four lines I get the top left corner, bottom right corner and figure out...

I've solved it, never mind! Thanks anyway - The empty text was set to null so I just changed null to "" and it worked. I wish the java website said that it made a difference!

Thanks, I got source is cmdSaveSettings so that means theres something wrong with my second if statement?

Sorry I don't understand, message saying program is inside ActionPerformed?

From what I got from that was

JOptionPane.showMessageDialog(add.ActionListener.this)

but thats not even the...

No that's not it...

I'm trying to show a dialog message if the user clicks a button and a text field is empty.


Action listener -

if(event.getSource() == cmdSaveSettings)
...

I had to repaint after the animation because after the animation played my grid which was painted before hand disappears and I didn't know why so I just added it again which stopped this happening....

The most illogical thread I've EVER read. Making a virus and then creating an Anti-virus for FREE. Developing a virus at all is kind of silly, not to mention running the code on your main computer.

That's the thing, I already tried bufferGraphics and it did work for everything apart from the animation. The code I have for it is:


// The object we will use to write with instead of the...

I have had to repaint a couple of times because of a moving shape I have added to my program whenever the mouse is clicked. I also have a moving shape that follows the mouse over a grid as well which...

This is a connect four game and I'm trying to show the counter falling. What I have so far is this which is in a for loop:



while(fallingCounter == true && x[j][i] < playerTurn)
...

lol yes I have the right name, I've looked at for a long time and row2 is a panel:

row1 = new JPanel();
row2 = new JPanel();

pNorth.add(row1, BorderLayout.NORTH);
...

Hi, I've followed the example in my lecture notes and it doesn't work! I want to add an image to a label and then add that label to my sub north panel. I want to do this with creating a new...

Thanks a lot guys, it now work and returns 24. If I took the static out it says a non static method cannot be referenced from the static method - makes sense - must be from static to static. I didn't...

Thanks a lot, return methods kind of represent the value of the method then...But what should I do when the fact(4) statement prints 'at recursiveTest.fact(recursiveTest.java:31)' ?

That's all of...

I have been trying to write simple return statements and print the result of the return. I have read books such as O-Reily and have used examples but find that the examples don't work either so I...

import mypackage.*;

import java.awt.event.*;
import java.awt.*;
import javax.swing.event.MouseInputListener;
import java.awt.event.MouseEvent;

import javax.swing.*;
import java.awt.Color;...

I'm a little lost now. When I get rid of extends JComponent it doesn't like "pCenter.add(mycounter);" but even when I have got that it's not doing anything; not even letting a circle appear. I...

I'm using panels as my container...Will panels work for this? I've replaced the code with your paintComponent code...Still no errors but not working. I've tried placing the actual circle to the...

Update for anyone still willing to help:
I've stopped getting the error for the class now but still no moving circle. Heres what I did to get rid of my error. My MouseMove code looks just the same...

This is what I had for my class circle component excluding your if statement:


package mypackage;
import java.awt.*;
import java.awt.Graphics2D;
import java.awt.Graphics;
import...

I'm trying to make a circle appear from a class I've developed to move following the x co-ordinate of the mouse. I've done that part correctly, it's just loading the class...Can anyone tell me why it...

There isn't exactly anything wrong with my code, it's fine although the order isn't correct, I think, which makes my shapes appear behind the center panel. I'm not sure how to correct this as I've...