Thread: Applet array paint/print question

Hi,

How do I paint or print an multi-array in applets?



Here is my code:

import java.awt.Graphics;
import javax.swing.*;
import java.applet.*;

public class Applettest extends JApplet {

public void init() {

int Choice = 0;

String userChoice = JOptionPane.showInputDialog("Enter a number, 0 to 2");
Choice = Integer.parseInt(userChoice);
paint(null,Choice);

}

public void paint(Graphics g, int testPass) {

String Multi[][]={{"Line 1","Line 2","Line 3"},{"Line 4","Line 5","Line 6"},{"Line 7","Line 8","Line 9"}};

g.drawString(Multi[testPass][testPass], 10,10);


}
}

My error:
java.lang.NullPointerException
at applets.Applettest.paint(Applettest.java…
at applets.Applettest.init(Applettest.java:…
at sun.applet.AppletPanel.run(AppletPanel.j…
at java.lang.Thread.run(Thread.java:722)

java.lang.NullPointerException
at applets.Applettest.paint(Applettest.java…

What variable is null? Your error message text has left off the line number where the error occurred.

paint(null,Choice);
Why do you call the paint() method with a null value?

If you want to override the paint method, You need to read the API doc for the paint() method to see how to code it.