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.*;
import javax.swing.JFrame;

/**	Author: David D. Riley
 *		Date: Jan, 2005
 *   Bordered Signs Program (Figure 4.19)
 */
	
public class Driver  {
	private JFrame  window;
	private Rectangle topSign, bottomSign;

	/**	post:	a window with two bordered signs is drawn  */
	public Driver()   {
		window = new JFrame("The Window");
		window.setBounds(10, 10, 250, 180);
		window.setLayout(null);
		window.setBackground(Color.white);
		window.setVisible(true);
		topSign = borderedSign( Color.green, "Home, Sweet Home" );
		topSign.setLocation(50, 20);
        window.add( topSign, 0 );
        
        bottomSign = borderedSign( Color.red, "Computers Rule!" );
        bottomSign.setLocation(50, 90);
        window.add( bottomSign, 0 );
        window.repaint();
	}
	
	/**	post:	result == a rectangle that is 150 pixels wide and 50 pixels high
     *          and  result has a border colored gray with mitered corners
	 *			and  the message s is displayed on result
     *          and  the colof of the center of result is c
	 */
	private  Rectangle  borderedSign(Color c, String s)   {
        Rectangle result;
        Line upperLeft, upperRight, lowerLeft, lowerRight;
        Label message; 
        result = new Rectangle(0, 0, 150, 50);
        result.setBackground( Color.lightGray );
        upperLeft = new Line(0, 0, 9, 9);
        result.add(upperLeft, 0);
        upperRight = new Line(149, 0, 140, 9);
        result.add(upperRight, 0);
        lowerLeft = new Line(0, 49, 9, 40);
        result.add(lowerLeft, 0);
        lowerRight = new Line(149, 49, 140, 40);
        result.add(lowerRight, 0);
        message = new Label(s);
        message.setBounds(10, 10, 130, 30);
        message.setBackground(c);
        result.add(message, 0);
        return result;
	}
}