Null pointer exception
i am getting a run time exception in the following program that says:
Exception in thread "main" java.lang.NullPointerException
at Home1.launchframe(Home1.java:58)
at Home1.main(Home1.java:77)
i would be extremely grateful if you could tell me where i have gone wrong.
import java.awt.*;
import java.awt.event.*;
public class Home1
{
private Frame f;
private Button b1,b2;
private Panel p;
public Home1()
{
Frame f=new Frame("custom");
p=new Panel();
b1=new Button("laugh");
b2=new Button("cry");
}
class painting extends Canvas
{
private int w;
private int h;
public void paint(Graphics d)
{
d.setColor(Color.YELLOW);
w=getWidth();
h=getHeight();
d.fillOval(w/6,h/8,2*w/3,3*h/4);
d.setColor(Color.BLACK);
d.drawOval(w/3,5*h/24,w/8,h/4);
d.drawOval(11*w/20,5*h/24,w/8,h/4);
int[] x;
int[] y;
x=new int[3];
y=new int[3];
x[0]=w/2;
x[1]=9*w/20;
x[2]=11*w/20;
y[0]=3*h/8;
y[1]=5*h/8;
y[2]=5*h/8;
d.drawPolygon(x,y,3);
d.drawLine(5*w/12,2*h/3,7*w/12,2*h/3);
d.drawArc(5*w/12,2*h/3-h/22,w/6,h/12,0,-180);
d.drawLine(28*w/60+w/100,h/2,32*w/60-w/100,h/2);
d.drawLine(57*w/120,5*h/12+h/15,63*w/120,5*h/12+h/15);
d.fillArc(w/3,h/4,w/8,h/5+h/60,0,-180);
d.fillArc(w/3,h/3-h/27,w/8,h/8,0,180);
d.fillArc(11*w/20,h/4,w/8,h/5+h/60,0,-180);
d.fillArc(11*w/20,h/3-h/27,w/8,h/8,0,180);
d.fillOval(19*w/40,h/6,w/20,h/20);
d.drawLine(w/2,3*h/20,w/2,7*h/30);
d.drawLine(19*w/40-w/60,23*h/120,19*w/40+w/15,23*h/120);
}}
public void launchframe()
{
f.setBackground(Color.BLUE);
f.setLayout(new BorderLayout());
p.setLayout(new FlowLayout());
painting w=new painting();
w.repaint();
f.add(w,BorderLayout.CENTER);
p.add(b1);
p.add(b2);
f.add(p,BorderLayout.SOUTH);
f.pack();
f.setVisible(true);
}
public static void main(String[] args) {
Home1 s=new Home1();
s.launchframe();
}
}
thanking you,
neavin
