driver.java

Java程序设计(美) David D. Riley著 机械工业出版社 书籍配套 代码

import java.awt.Color;
import javax.swing.JFrame;

/**	Author: David D. Riley
 *		Date: Jan, 2005
 *   Random Oval (Figure 6.1)
 */
	
public class Driver  {
	private JFrame  window;
	private Oval redOval;

	/**	post:	A window is displayed
	 *		and  a randomly-sized red oval is displayed.  
	 */
	public Driver()   {
		window = new JFrame("Random Red Oval");
		window.setBounds(10, 10, 600, 500);
		window.setVisible(true);
		window.setLayout(null);
		redOval = new Oval( (int)(Math.random()*600),(int)(Math.random()*500),
					     	     (int)(Math.random()*600),(int)(Math.random()*500) );
		redOval.setBackground(Color.red);
		window.add(redOval, 0);
		window.repaint();
	}
}