popupcalculatorapplet.java

来自「经典教材：java核心技术卷1、卷2的所有源代码」· Java 代码 · 共 39 行

/**
   @version 1.31 2004-05-07
   @author Cay Horstmann
*/

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

public class PopupCalculatorApplet extends JApplet
{  
   public void init()
   {  
      // create a frame with a calculator panel
      
      final JFrame frame = new JFrame();
      frame.setTitle("Calculator");
      frame.setSize(200, 200);
      frame.add(new CalculatorPanel());

      // add a button that pops up or hides the calculator
      
      JButton calcButton = new JButton("Calculator");
      add(calcButton);

      calcButton.addActionListener(new
         ActionListener()
         {
            public void actionPerformed(ActionEvent event)
            {  
               frame.setVisible(!frame.isVisible());
            }
         });
   }
}