Problems buffering.....

Question

Okay, I am trying to create my image for buffering but I keep getting this error:
Exception in thread "main" java.lang.NullPointerException
at SCDraw.<init>(SCDraw.java:19)
at SCDraw.main(SCDraw.java:73)
It says the line of code causing the problem is this:
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
import java.util.*;
public class SCDraw extends JFrame
private int x = 10, y = 10;
private RepaintManager r;
private Image imgOffScreen;
private Canvas canPaintArea;
private Graphics OffScreen;
public SCDraw()
super("Semi-Colen Paint Program.");
imgOffScreen = createImage(getSize().width, getSize().height);
OffScreen = imgOffScreen.getGraphics(); <--------This is the line causing the error, or so says the compiler.
Container c = getContentPane();
I can't seem to fix it, so I ask you, what is worng here?

Answer 1

hi,
Well itz a problem with your code
imgOffScreen = createImage(getSize().width, getSize().height);
OffScreen = imgOffScreen.getGraphics(); <--------This is the line causing the error, or so says the compiler.you are doing a call to getSize() before even you set the size of your Frame.
move the code to after the Frame is realized, move it after setVisible(true) and it will work..
cheerz
ynkrish