java中用swing做一个windows计算器

前言：
来看这篇教程估计都是java课程设计吧，现在已经没有公司很少使用swing组件了，java主要还是开发Web方面，可以了解以下swing组件仅此而已。我们这是一个组做的课程设计，一共写了三个：window画板，解码器，计算器，我只写了计算器，所以我将计算器的代码单独发布

一个最简单的计算器，一个类
https://blog.youkuaiyun.com/dark_souls/article/details/90637768

主函数

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

class menu_li001 {
   
   
    public static void main(String[] args) {
   
   
        menu_li002 li = new menu_li002();
        li.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        li.setVisible(true);
        li.pack();
        li.setSize(600,100);

    }
}

class menu_li002 extends JFrame{
   
   
    static int i;
    public menu_li002(){
   
   
        TextField f1 = new TextField(24);
        new Box(BoxLayout.X_AXIS);
        JPanel card=new JPanel();
        CardLayout Clayout=new CardLayout();
        JPanel mi = new JPanel();
        JRadioButton choose02 = new JRadioButton("计算器");
        JLabel  calculter =new   JLabel(new ImageIcon("src/calculter.jpg"));
        Box h = Box.createHorizontalBox();
        Box h1 = Box.createHorizontalBox();
        Box vbox = Box.createVerticalBox();
        ButtonGroup bg1 = new ButtonGroup();
        ButtonGroup bg2 = new ButtonGroup();
        ButtonGroup bg3 = new ButtonGroup();
        bg2.add(choose02);
        h.add(choose02);
        h1.add(f1);
        vbox.add(h);
        vbox.add(h1);
        setContentPane(vbox);
        mi.add(h);
        mi.add(h1);
        card.add(mi);
        add(card);
        choose02.addActionListener(new ActionListener() {
   
   
            @Override
            public void actionPerformed(ActionEvent e) {
   
   
                // TODO Auto-generated method stub
                f1.setText("你选中:" + choose02.getText());
                add(BorderLayout.SOUTH,calculter);
                //contentPane.add(calculter);
                CacultorL window=new CacultorL();
                window.setSize(500,300);
              window.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
                window.pack();
                window.setJMenuBar(CacultorL.menuBar);
                window.setVisible(true);
                bg1.clearSelection();
                bg3.clearSelection();
            }
        });
    }
}

打开界面如下图：

普通计数器

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.*;

public class CacultorL extends JFrame implements ActionListener{
   
   
    JPanel cards;
    CardLayout Clayout=new CardLayout();
    JPanel cardNorth;
    private final String keys[]={
   
   "%","√","x^2","1/x","CE","C","<-","/","7","8","9","*","4","5","6","-","1","2","3","+","+/-","0",".","="};
    private final String Rom[]={
   
   "MC","MR","M+","M-","MS","M"};
    private JButton Keys[]=new JButton[keys.length];
    private JButton rom[]=new JButton[Rom.length];
    static JMenuBar menuBar=new JMenuBar();
    JPanel CenterPanel=new JPanel();
    JPanel NorthPanel=new JPanel();
    JPanel SouthPanel=new JPanel();
    JTextField textField=new JTextField(17);
    JTextField textFieldUp=new JTextField(17);
    private double left;
    private double right;
    private static double result;
    private String Result;
    private String temp="";
    private static int option;
    private static String temp1="";
    private static int option1=0;
    private  static double right1;

    public static void main(String[] args) throws IOException {
   
   
        CacultorL window=new CacultorL();
        window.setSize(500,300);
        window.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        window.pack();

        window.setVisible(true);
        DataOutputStream dataOutputStream=new DataOutputStream(new FileOutputStream("src/a.dat"));
        dataOutputStream.writeDouble(result);
    }
    public CacultorL()  {
   
   
//       File Datap=new File("DataIn.txt");
//       FileWriter in=new FileWriter(Datap);

        JMenu fileItem=new JMenu("      功能菜单");
        JMenuItem card1=new JMenuItem("           科学");
        // JMenuItem card2=new JMenuItem("           标准");
        menuBar.add(fileItem);
        fileItem.add(card1);
        // fileItem.add(card2);
        cards=new JPanel();
        cards.setLayout(Clayout);
        cardNorth=new JPanel();
        cardNorth.setLayout(Clayout);
        SouthPanel.setLayout(new GridLayout(2,1));
        CenterPanel.setLayout(new GridLayout(6,4));
        NorthPanel.setLayout(new GridLayout(1,6));
        CenterPanel.setPreferredSize(new Dimension(250,150));
        NorthPanel.setPreferredSize(new Dimension(350,70));
        addRom(Rom);
        for(int i=0;i<keys.length;i++) {
   
   
            addKeys(keys[i],i);
        }
        SouthPanel.add(textFieldUp);
        SouthPanel.add(textField);
        add(SouthPanel,BorderLayout.NORTH);
        Kcacultor a=new Kcacultor();
//       add(a.center1,BorderLayout.SOUTH);
        add(NorthPanel,BorderLayout.CENTER);
        cards.add(CenterPanel);
        cards.add(a.center1);
        cardNorth.add(SouthPanel);
        cardNorth.add(a.NorthPanel);
        //Kcacultor.center1.setBackground(Color.BLACK);
        add(BorderLayout.SOUTH,cards);
        add(BorderLayout.NORTH,cardNorth);
        textField.setHorizontalAlignment(JTextField.RIGHT);
        textField.setEditable(false);
        textFieldUp.setHorizontalAlignment(JTextField.RIGHT);
        textFieldUp.setEditable(false);
        card1.addActionListener(new ActionListener() {
   
   
            @Override
            public void actionPerformed(ActionEvent e) {
   
   
                Clayout.next(cards);
                Clayout.next(cardNorth);
                textField.setText("");
                textFieldUp.setText("");
                temp="";
                temp1="";
                left=0;
                right=0;
            }
        });

    }
    public void addKeys(String keys,int i){
   
   
        Keys[i]= new  JButton(keys);
        CenterPanel.add(Keys[i]);
        Keys[i].addActionListener(this);
    }
    public void addRom(String Rom[]){
   
   
        for(int i=0;i<Rom.length;i++){
   
   
            rom[i]= new  JButton(Rom[i]);
            NorthPanel.add(rom[i]);
        }
    }
    @Override
    public void actionPerformed(ActionEvent e) {
   
   

        if(e.getSource()==Keys[8]){