windowhandler.java

本“计算器”可以完成任意的通常借助手持计算器来完成的标准运算。“计算器”可用于基本的算术运算

///////    WindowHandler.java    ///////

import java.awt.Frame;
import java.awt.event.*;

/** Handles Window Closing Event
 *      action: terminate program
 */

public class WindowHandler extends WindowAdapter
{   WindowHandler(Frame f)  { fr = f; } 

    public void windowClosing(WindowEvent e) 
    {  fr.setVisible(false); 
       fr.dispose();
       System.exit(0);
    }

    private Frame fr = null; 
}