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();
    }
}