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
 *   Happy Faces Program (Figure 4.14)
 */
	
public class Driver  {
	private JFrame  theWindow;
	private Oval topLeftFace, topRightFace, botLeftFace, botRightFace;

	/** post: a window with four happy faces is drawn  */
	public Driver()   {
		theWindow = new JFrame("The Window");
		theWindow.setBounds(10, 10, 250, 250);
		theWindow.setLayout(null);
		theWindow.setBackground(Color.white);
		theWindow.setVisible(true);
		topLeftFace = new Oval(30, 10, 100, 100);
		makeHappyFace(topLeftFace);
		theWindow.add(topLeftFace, 0);
        topLeftFace.repaint();
		topRightFace = new Oval(140, 10, 100, 100);
		makeHappyFace(topRightFace);
		theWindow.add(topRightFace, 0);
        topRightFace.repaint();
		botLeftFace = new Oval(30, 120, 100, 100);
		makeHappyFace(botLeftFace);
		theWindow.add(botLeftFace, 0);
        botLeftFace.repaint();
		botRightFace = new Oval(140, 120, 100, 100);
		makeHappyFace(botRightFace);
		theWindow.add(botRightFace, 0);
        botRightFace.repaint();
	}
	
	/**	pre:	f has been constructed with a radius of 100
     *	post:	f is colored yellow  
 	 *			and  two black eyes are added to f
	 *			and  a black smile is added to f 
	 */
	private  void  makeHappyFace( Oval f )   {
		Oval leftEye, rightEye, mouth, mouthCover;
		f.setBackground( Color.yellow );
		mouth = new Oval( 20, 20, 60, 60 );
		f.add(mouth, 0);
		mouthCover = new Oval( -10, -30, 80, 80 );
		mouthCover.setBackground(Color.yellow);
		mouth.add(mouthCover, 0);
		leftEye = new Oval( 20, 30, 15, 15 );
		f.add(leftEye, 0);
		rightEye = new Oval( 65, 30, 15, 15);
		f.add(rightEye, 0);
	}
}