nothelloworld.java

java2核心技术(sun公司)原书第七版的源码

/**
   @version 1.31 2004-05-03
   @author Cay Horstmann
*/

import javax.swing.*;
import java.awt.*;

public class NotHelloWorld
{  
   public static void main(String[] args)
   {  
      NotHelloWorldFrame frame = new NotHelloWorldFrame();
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.setVisible(true);
   }
}

/**
   A frame that contains a message panel
*/
class NotHelloWorldFrame extends JFrame
{
   public NotHelloWorldFrame()
   {
      setTitle("NotHelloWorld");
      setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

      // add panel to frame

      NotHelloWorldPanel panel = new NotHelloWorldPanel();
      add(panel);
   }

   public static final int DEFAULT_WIDTH = 300;
   public static final int DEFAULT_HEIGHT = 200;  
}

/**
   A panel that displays a message. 
*/
class NotHelloWorldPanel extends JPanel
{  
   public void paintComponent(Graphics g)
   {  
      super.paintComponent(g);

      g.drawString("Not a Hello, World program", MESSAGE_X, MESSAGE_Y);
   }

   public static final int MESSAGE_X = 75;
   public static final int MESSAGE_Y = 100;
}