Can anyone help me with how to draw line in java

Question

import java.awt.Graphics;
import java.awt.Color;
class Dcoder
{
public void paint(Graphics g)
{
g.drawLine(0,480,960,480);
}
public static void main(String args[])
{
Dcoder ob=new Dcoder();
ob.paint(null);
}
}
output-
Exception in thread "main" java.lang.NullPointerException
at Dcoder.paint(source.java:7)
at Dcoder.main(source.java:12)

take Dcoder as line and if possible plz tell what's the problem is

Answer 1

Judging from the surface, you passed null into paint(), and hence you invoked drawLine() using a null pointer.

I have no idea how awt graphics are supposed to work, but you can try:

ob.paint(new Graphics());