Java简易计算器，

来源： javaer 分享于 2025-07-02 点击 45689 次点评：203

Java简易计算器，

只实现了加功能。
import java.applet.*;
import java.awt.*;
import java.util.*;
import java.awt.event.*;

public class Calculator extends Applet implements ActionListener{
   Button[] bu_array = new Button[10];
   TextField result = new TextField(30);
   private int before ;
   Button add = new Button("+");
   Button equal = new Button("=");

   public void init(){
       Panel p_text = new Panel();
       Panel p_num = new Panel();
       Panel p_calc = new Panel();

       this.setLayout(new BorderLayout());
       this.add(p_text, BorderLayout.NORTH);
       this.add(p_num, BorderLayout.CENTER);
       this.add(p_calc, BorderLayout.EAST);

       p_text.add(result);

       p_num.setLayout(new GridLayout(4,3));


       for(int i=0; i<bu_array.length; i++){
           bu_array[i] =new Button(Integer.toString(i));
           p_num.add(bu_array[i]);
           bu_array[i].addActionListener(this);
       }

       p_calc.setLayout(new GridLayout(4,2));

       Button sub = new Button("-");
       Button mul = new Button("*");
       Button div = new Button("/");
       Button mod = new Button("%");
       Button clear = new Button("C");

       p_calc.add(add);
       p_calc.add(sub);
       p_calc.add(mul);
       p_calc.add(div);
       p_calc.add(mod);
       p_calc.add(equal);
       p_calc.add(clear);

       add.addActionListener(this);
       sub.addActionListener(this);
       mul.addActionListener(this);
       div.addActionListener(this);
       mod.addActionListener(this);
       equal.addActionListener(this);
       clear.addActionListener(this);
   }

   public void actionPerformed(ActionEvent e){
       Object source =   e.getSource();

       if(source.equals(add)){
           this.before = Integer.parseInt(result.getText());
           result.setText("");
       }

       if(source.equals(equal)){
           result.setText(Integer.toString((this.before + Integer.parseInt(result.getText()))));
       }

       for(int i=0; i<bu_array.length; i++){
           if(source.equals(bu_array[i])){
               result.setText(result.getText()+Integer.toString(i));
           }
       }

   }

   public static void main(String [] args){
   }
}
<html>
<head></head>
<body>
<applet height="200" width="200" code="Calculator.class"></applet>
</body>
</html>

Java简易计算器，

Java简易计算器，

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