import java.awt.event.*;
import java.awt.*;
import javax.swing.*;

public class MyBox extends JFrame implements ActionListener {
	public static final int HORIZONTAL_STRUT_SIZE = 15;
	public static final int VERTICAL_STRUT_SIZE = 10;
	public JPanel colorPanel;
	
	public MyBox() {
		setLocation(400,200);
		setSize(200,200);
		setTitle("MyBox");
		
		setDefaultCloseOperation(EXIT_ON_CLOSE);
			
		colorPanel = new JPanel();
		Container con = getContentPane();
		con.setBackground(Color.white);
		con.setLayout(new BorderLayout());
		con.add(colorPanel, BorderLayout.CENTER);
		
		JPanel horizontalPanel = new JPanel();
		horizontalPanel.setLayout(new BoxLayout (horizontalPanel, BoxLayout.X_AXIS));
		
		Component horizontalStrut = Box.
		createHorizontalStrut(HORIZONTAL_STRUT_SIZE);
		horizontalPanel.add(horizontalStrut);
			
		JButton red = new JButton("red");
		red.addActionListener(this);
		horizontalPanel.add(red);
		
		Component horizontalStrut2 = Box.createHorizontalStrut (HORIZONTAL_STRUT_SIZE);
		horizontalPanel.add(horizontalStrut2);
		
		JButton green = new JButton("green");
		green.addActionListener(this);
		horizontalPanel.add(green);
		con.add(horizontalPanel, BorderLayout.SOUTH);
		
			JPanel verticalPanel = new JPanel();
			verticalPanel.setLayout(new BoxLayout (verticalPanel, BoxLayout.Y_AXIS));
		
		Component verticalStrut = Box.createVerticalStrut(VERTICAL_STRUT_SIZE);
		verticalPanel.add(verticalStrut);
			
		JButton blue = new JButton("blue");
		blue.addActionListener(this);
		verticalPanel.add(blue);
		
		Component verticalStrut2 = Box.createVerticalStrut (VERTICAL_STRUT_SIZE);
		verticalPanel.add(verticalStrut2);
		
		JButton yellow = new JButton("yellow");
		yellow.addActionListener(this);
		verticalPanel.add(yellow);
		con.add(verticalPanel, BorderLayout.EAST);
	}
	public void actionPerformed (ActionEvent e) {
		Container con = getContentPane();
		if(e.getActionCommand().equals("red")) {
			colorPanel.setBackground(Color.red);
		}
		else
			if(e.getActionCommand().equals("green")){
				colorPanel.setBackground(Color.green);
			}
			else
				if(e.getActionCommand().equals("blue")){
					
		colorPanel.setBackground(Color.blue);
				}
				else
				if(e.getActionCommand().equals("yellow")){
					colorPanel.setBackground(Color.yellow);
				}
				else {
					System.out.println("ERROR");
				}
	}
	public void windowClosing(WindowEvent ev){
		System.exit(0);
	}
	public static void main (String [] args) {
		new MyBox().setVisible(true);
	}
}