button.java

/*Author -: Chamila Wijayarathna
 * 
 * This simple java application is changing the color of background according to a button click
 * 
 * 
 */

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

public class Button {
	public static void main(String[] args) {
		ButtonFrame frame = new ButtonFrame();
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.show();

	}

}

class ButtonFrame extends JFrame {
	public ButtonFrame() {
		setTitle("ButtonTest");
		setSize(WIDTH, HEIGHT);
		ButtonPanel panel = new ButtonPanel();
		Container contentPane = getContentPane();
		contentPane.add(panel);
	}

	public static final int WIDTH = 300;
	public static final int HEIGHT = 200;
}

class ButtonPanel extends JPanel {
	public ButtonPanel() {

		JButton yellowButton = new JButton("Yellow");
		JButton blueButton = new JButton("Blue");
		JButton redButton = new JButton("Red");

		add(yellowButton);
		add(blueButton);
		add(redButton);

		ColorAction yellowAction = new ColorAction(Color.yellow);
		ColorAction blueAction = new ColorAction(Color.blue);
		ColorAction redAction = new ColorAction(Color.red);

		yellowButton.addActionListener(yellowAction);
		blueButton.addActionListener(blueAction);
		redButton.addActionListener(redAction);
	}

	private class ColorAction implements ActionListener {
		public ColorAction(Color c) {
			backgroundColor = c;
		}

		public void actionPerformed(ActionEvent event) {
			setBackground(backgroundColor);
			repaint();
		}

		private Color backgroundColor;
	}

}