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Thanks. It's done now!

Here is my modified code:


import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class del1 extends JFrame{
JPanel panel1;
JButton button,button2;
public del1()

When the following program is compiled:

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class del1 extends JFrame{
public del1()
{
JPanel panel1=new JPanel();...