AWT-Abstract Window Toolkit

 import java.applet.*;
 import java.awt.*;
 import java.awt.event.*;
 class MyFrame extends Frame 
 implements ActionListener
 {
    Button b1,b2,b3;
    public MyFrame()
    {
        this.setLayout(null);
        b1=new Button(); add(b1); b1.addActionListener(this);
        b2=new Button(); add(b2); b2.addActionListener(this);
        b3=new Button(); add(b3); b3.addActionListener(this);
        b1.setBackground(Color.red);
        b2.setBackground(Color.green);
        b3.setBackground(Color.blue);
        b1.setBounds(200,15,90,50);
        b2.setBounds(200,75,90,50);
        b3.setBounds(200,135,90,50);
    }
    public void actionPerformed(ActionEvent e)
    {
        Button bs=(Button)e.getSource();
        Color cs=bs.getBackground();
        Graphics g=this.getGraphics();
        g.setColor(cs);
        g.fillOval(25,25,150,150);
    }
 }
 class demo
 {
    public static void main(String args[])
    {
        MyFrame frm=new MyFrame();
        frm.setVisible(true);
        frm.setSize(400,300);
    }
 }