Swing Program to Change Color on Click of Button

Program discussed below have 4 JButton's arranged in following manner.

When the buttons Red,Green and Blue are clicked it changes the color of Display button.

DisplayColor.java

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

class DisplayColor extends JFrame implements ActionListener 

{

   JButton jbtnDisplay,jbtnRed,jbtnGreen,jbtnBlue;

   Color cR=Color.RED;

   Color cG=Color.GREEN;

   Color cB=Color.BLUE;

   DisplayColor()

{

       super ("DISPLAY COLOR");

  setSize(1000,500);

  setResizable(false);

  setDefaultCloseOperation(EXIT_ON_CLOSE);

       setLayout(null);

  Container c=getContentPane();

  jbtnDisplay=new JButton("");

  jbtnDisplay.setBounds(200,100,500,200);

  jbtnDisplay.setBackground(Color.BLACK);

  jbtnDisplay.addActionListener (this);

  c.add (jbtnDisplay);

       jbtnRed=new JButton("RED");

  jbtnRed.setBounds(50+100,350,100,50);

  jbtnRed.addActionListener (this);

  c.add (jbtnRed);

 

  jbtnGreen=new JButton("GREEN");

  jbtnGreen.setBounds(250+100,350,100,50);

  jbtnGreen.addActionListener (this);

  c.add (jbtnGreen);

   

        jbtnBlue=new JButton("BLUE");

   jbtnBlue.setBounds(450+100,350,100,50);

  jbtnBlue.addActionListener (this);

  c.add (jbtnBlue);

          

 setVisible(true);

}

public void actionPerformed(ActionEvent ae)

{

        if (ae.getSource()==(jbtnRed))

        {

jbtnDisplay.setBackground(Color.RED);

        }

if (ae.getSource()==(jbtnGreen))

        {

jbtnDisplay.setBackground(Color.GREEN);

        }

if (ae.getSource()==(jbtnBlue))

        {

jbtnDisplay.setBackground(Color.BLUE);

        }

}

  public static void main (String [] args)

{

  DisplayColor app=new DisplayColor();

  }

}