Java program to create button

import java.awt.*;

import java.awt.event.*;



public class Button extends Frame implements ActionListener

{

  Button rb, gb, bb; // create 3 button var

  public ButtonDemo()            
  {

    FlowLayout fl = new FlowLayout();    // choose any layout i choose flow layout

    setLayout(fl);



    rb = new Button("Red");. // map variables to objects

    gb = new Button("Green");

    bb = new Button("Blue");



    rb.addActionListener(this);   // link the listener with the button

    gb.addActionListener(this);

    bb.addActionListener(this);



    add(rb);            // add button to frame

    add(gb);

    add(bb);   



    setTitle("Buttons Created");

    setSize(300, 350);                      // size of frame

    setVisible(true);    // to make frame visible on screen

  }

                   // override the only abstract method of ActionListener interface

  public void actionPerformed(ActionEvent e)

  {

    String str = e.getActionCommand();    // to know which Java button user clicked

    System.out.println("You clicked " + str + " button");  // just beginner's interest



    if(str.equals("Red"))

    {

      setBackground(Color.red);

    }

    else if(str.equals("Green"))

    {

      setBackground(Color.green);

    }

    else if(str.equals("Blue"))

    {

      setBackground(Color.blue);

    }

  }

  public static void main(String args[])

  {

    new ButtonDemo();                       // anonymous object of ButtonDemo just to call the constructor

  }                    // as all the code is in the constructor

}