swinghello.java

来自「java 完全探索的随书源码」· Java 代码 · 共 53 行

// SwingHello.java

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

class SwingHello extends JFrame implements ActionListener
{
   JButton b;

   static String [] labels =
   {
      "Hello! Welcome to Swing!",
      "You can assign icons to Swing buttons."
   };

   int nextLabel;

   SwingHello (String title)
   {
      super (title);

      addWindowListener (new WindowAdapter ()
                         {
                             public void windowClosing (WindowEvent e)
                             {
                                System.exit (0);
                             }
                         });

      JPanel p = new JPanel ();
      b = new JButton (labels [nextLabel++],
                       new ImageIcon ("bullet.gif"));
      b.addActionListener (this);
      p.add (b);
      setContentPane (p);

      setSize (300, 100);
      setVisible (true);
   }

   public void actionPerformed (ActionEvent e)
   {
      b.setText (labels [nextLabel++]);
      nextLabel %= labels.length;
   }

   public static void main (String [] args)
   {
      new SwingHello ("Hello, Swing Version");
   }
}