Java实现简单计算器基本功能

最新推荐文章于 2025-07-06 20:08:11 发布

原创最新推荐文章于 2025-07-06 20:08:11 发布 · 3.3k 阅读

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本文详细介绍了一款基于Java Swing的简易计算器的设计与实现过程，包括界面布局、按钮响应及基本算术运算处理。通过GridLayout和BorderLayout实现了计算器的直观布局，同时利用ActionListener处理按钮点击事件，完成数字输入与四则运算。

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package b;
import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.StringTokenizer;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class calulatorDemo {
public static void main(String[]args){
   Calulator calu=new Calulator();
}
}
class Calulator extends JFrame{
private JButton clear_Button=new JButton("Clear");//清除按钮
       private JButton Button[]=new JButton[16];//定义按钮数组对象
       private JTextField name =new JTextField(30);//文本组件
       private String button[]={"7","8","9","+","4","5","6","-","1","2","3","*","0",".","/","="};

   public Calulator(){
   super("欢迎来到编译的计算器！！！！！");
       for(int i=0;i<button.length;i++){
           Button[i]=new JButton(button[i]);

       }



       JPanel pan=new JPanel();//定义面板
       JPanel pan2=new JPanel();

       pan.setLayout(new GridLayout(4,4,5,5));//布局管理器1，设置为格子面板
       for(int j=0;j<Button.length;j++){
           pan.add(Button[j]);//按钮添加到面板1中
       }
       for(int t=0;t<Button.length-1;t++){
           Button[t].addActionListener(new ActionListener(){//添加到按钮事件

               @Override
               public void actionPerformed(ActionEvent e) {

                   // TODO Auto-generated method stub
                   name.setText(name.getText()+e.getActionCommand());//设置文本面板，添加按钮



               }

           });
       }

       pan2.setLayout(new BorderLayout());//面板2布局模式为方向
       pan2.add(name, BorderLayout.WEST);//将文本组件加入面板西边
       pan2.add(clear_Button, BorderLayout.EAST);
       clear_Button.addActionListener(new ActionListener(){//定义清除按钮清空文本区域

           @Override
           public void actionPerformed(ActionEvent e) {
               // TODO Auto-generated method stub
               name.setText("");
           }

       });//按钮满足的条件

       //等号按钮控制的事件
       Button[15].addActionListener(new ActionListener(){

           @Override
           public void actionPerformed(ActionEvent e) {
               // TODO Auto-generated method stub
               //name.setText(name.getText()+e.getActionCommand());
               if(name.getText().contains("+")){//加法满足的算法
                   StringTokenizer string1 = new StringTokenizer(name.getText(),"+");   //分解字符串
                   double d1=0;
                   while(string1.hasMoreTokens()){//StringTokenizer的构造方法
                       d1=d1+Double.parseDouble(string1.nextToken());
                   }

                   name.setText(name.getText()+e.getActionCommand()+d1);

               }

               if(name.getText().contains("-")){
                   StringTokenizer string2=new StringTokenizer(name.getText(),"-");
                   double d2=0;
                   while(string2.hasMoreTokens()){
                       d2=(-Double.parseDouble(string2.nextToken()))-d2;

                   }
                   name.setText(name.getText()+e.getActionCommand()+d2);
               }

           if(name.getText().contains("*")){
               StringTokenizer string3=new StringTokenizer(name.getText(),"*");
               double d3=1;
               while(string3.hasMoreTokens()){
                   d3=d3*Double.parseDouble(string3.nextToken());
               }
               name.setText(name.getText()+e.getActionCommand()+d3);
           }
           if(name.getText().contains("/")){
               StringTokenizer string4=new StringTokenizer(name.getText(),"/");
               double d4=1,d5=1;
               while(string4.hasMoreTokens()){
                   d4=Double.parseDouble(string4.nextToken())/Double.parseDouble(string4.nextToken());

               }
               name.setText(name.getText()+e.getActionCommand()+d4);
           }

           }

           });



       super.getContentPane().setLayout(new BorderLayout());
       super.getContentPane().add(pan2, BorderLayout.NORTH);
       super.getContentPane().add(pan, BorderLayout.CENTER);
super.setSize(400, 400);//窗体大小
       super.setLocation(300,200);//窗体显示位置
   super.setVisible(true);

   }


}