First portion of Java Bean

Colors.java

package sample;
//A simple Bean.
import java.awt.*;
import java.awt.event.*;
import java.io.Serializable;
public class Colors extends Canvas implements Serializable {
	transient private Color color; // not persistent
	  private boolean rectangular; // is persistent
	  public Colors() {
	    addMouseListener(new MouseAdapter() {
	      public void mousePressed(MouseEvent me) {
	        change();
	      }
	    });
	    rectangular = false;
	    setSize(200, 100);
	    change();
	  }

	  public boolean getRectangular() {
	    return rectangular;
	  }

	  public void setRectangular(boolean flag) {
	     this.rectangular = flag;
	     repaint();
	  }

	  public void change() {
	    color = randomColor();
	    repaint();
	  }

	  private Color randomColor() {
	     int r = (int)(255*Math.random());
	     int g = (int)(255*Math.random());
	     int b = (int)(255*Math.random());
	     return new Color(r, g, b);
	  }

	  public void paint(Graphics g) {
	    Dimension d = getSize();
	    int h = d.height;
	    int w = d.width;
	    g.setColor(color);
	    if(rectangular) {
	      g.fillRect(0, 0, w-1, h-1);
	    }
	    else {
	      g.fillOval(0, 0, w-1, h-1);
	    }
	  }
}