Exercise2- Color Cycle

/*Programmer: Miexie D. Tulid
 *Date started: March 13, 2009
 *Date ended: March 18, 2009
 *Description: A program that used button and once it clicked, the background

  changed with corresponds to its button name.*/

/*Programmer: Miexie D. Tulid
 *Date started: March 13, 2009
 *Date ended: March 18, 2009
 *Description: A program that used button and once it clicked, the background
  changed with corresponds to its button name.*/
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;


public class ColorCycle extends JFrame 
    implements ActionListener {

  private WindowTerminator wt = new WindowTerminator(); // Code below
  private JButton red,blue, green, gray; // the JButtons which will cause the background colors to change
  private Container cp; // our contentpane

  public ColorCycle( ) {
  setSize(300,300);
  setLocation(100,100);
  setTitle(getClass().getName());


  addWindowListener(wt);

  red = new JButton("Red");
  green = new JButton("Green");
  blue = new JButton("Blue");
  gray = new JButton("Gray");
  red.addActionListener(this);
  green.addActionListener(this);
  blue.addActionListener(this);
  gray.addActionListener(this);
   
  cp = getContentPane();
  cp.setBackground(Color.white);
  cp.setLayout(new FlowLayout());
  cp.add(red);
  cp.add(green);
  cp.add(blue);
  cp.add(gray);

  show();
  }


  public void actionPerformed(ActionEvent e) {

  JButton s = (JButton) e.getSource(); //get the source of the event

  if ( s == red) cp.setBackground(Color.red);
  else if ( s == green) cp.setBackground ( Color.green);
  else if ( s == blue) cp.setBackground ( Color.blue);
else if ( s == gray) cp.setBackground ( Color.gray);


  cp.repaint();
  }


  public static void main (String[] args) {

  JFrame f = new ColorCycle();
  }

}

class WindowTerminator extends WindowAdapter {

  public void windowClosing (WindowEvent e) {
  System.exit(0);
  }
}