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
 *   An erroneous prototype of the caterpillar program (Figure 3.28)
 */
	
// This prototype contains two logic errors. 
public class Driver  {
    private  JFrame  theWindow;
    private  Oval  head, frontSegment, midSegment, rearSegment;

    public Driver()   {
        theWindow = new JFrame( "The Pede" );
        theWindow.setBounds(10, 10, 500, 250);
        theWindow.setLayout(null);
        theWindow.setVisible(true);
        head = new Oval(110, 70, 80, 80 );
        theWindow.add(head, 0);
        head.repaint();
        frontSegment = new Oval(180, 100, 50, 50);
        theWindow.add(frontSegment, 0);
        frontSegment.repaint();
        midSegment = new Oval(230, 100, 0, 50);
        theWindow.add(midSegment, 0);
        midSegment.repaint();
        rearSegment = new Oval(180, 100, 50, 50);
        theWindow.add(rearSegment, 0);
        rearSegment.repaint();
    }
}