calculatorbutton.java

个人财务管理的程序 很实用的

import java.io.*;
import java.util.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.border.*;
import javax.swing.table.*;

//该类为计算器按钮增添了监听器
class CalculatorButton extends JButton 
   implements ActionListener {
   public CalculatorButton() {
      setText("计算器");
      setIcon(new ImageIcon("calculator.gif"));
      addActionListener(this);
   }

   public void actionPerformed(ActionEvent e) {
      if(f==null) {
         f=new CalculatorFrame();
         f.show();
      }
      else f.show();
   }
   private JFrame f=null;
}