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.*;

/**	Author: David D. Riley
 *		Date: Jan, 2005
 *   Program to illustrate events in recoloring a square (Figure 4.25)
 */
	
public class Driver extends ThreeButtons {
	private ThreeButtonFrame  window;
	private Rectangle square;

	/** post:	a window with a 100 by 100 filled black square is drawn
     *			and button actions control recoloring of the square  
     */
	public Driver()   {
		window = new ThreeButtonFrame("Square Recoloring Window");
		window.setLayout(null);
		square = new Rectangle(250, 150, 100, 100);
		window.add(square, 0);
		square.repaint();
	}
	
	/**	pre:	square is constructed	
	 *	post:	square is colored green  and  square is repainted   
	 */
	public  void  leftAction()   {
		square.setBackground( Color.green );
		square.repaint();
	}

	/**	pre:	square is constructed	
     *	post:	square is colored red  and  square is repainted   
     */
	public  void  midAction()   {
		square.setBackground( Color.red );
		square.repaint();
	}
 

	/** 	pre:	square is constructed	
	 *	post:	square is colored blue  and  square is repainted   
	 */
	public  void  rightAction()   {
		square.setBackground( Color.blue );
		square.repaint();
	}
}