ActionEvent

Example of ActionEvent

import java.awt.*;
import java.awt.event.*;

class A implements ActionListener
{
Frame f;
Button b1,b2,b3,b4;
A()
{
 f=new Frame();
 f.setSize(500,500);
 f.setLayout(new BorderLayout());
 Panel p=new Panel();
 p.setBackground(Color.cyan);
 b1=new Button("Red");
 b2=new Button("green");
 b3=new Button("Blue");
 b4=new Button("Exit");
 p.add(b1);
 p.add(b2);
 p.add(b3);
 p.add(b4);
 f.add("North",p);
 b1.addActionListener(this);
 b2.addActionListener(this);
 b3.addActionListener(this);
 b4.addActionListener(this);
 f.setVisible(true);
}

public void actionPerformed(ActionEvent e)
{
try
{
if(e.getSource().equals(b1))
{
f.setBackground(Color.red);
}
else if(e.getSource().equals(b2))
{
f.setBackground(Color.green);
}
else if(e.getSource().equals(b3))
{
f.setBackground(Color.blue);
}
else if(e.getSource().equals(b4))
{
System.exit(0);
}
}
catch (Exception ec)
{
System.out.println(ec);
}
}
};

class ActionEventEx
{
public static void main(String[] args) 
{
A a1=new A();
}
}