【JAVA】实现的一个简单计算器

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

public class Computer extends JFrame {
    JPanel jPanelText;
    JTextField textField;
    JPanel jPanelButton;
    JButton jButton7;
    JButton jButton8;
    JButton jButton9;
    JButton jButtonchu;
    JButton jButton4;
    JButton jButton5;
    JButton jButton6;
    JButton jButtoncheng;
    JButton jButton1;
    JButton jButton2;
    JButton jButton3;
    JButton jButtonjian;
    JButton jButtondian;
    JButton jButton0;
    JButton jButtondeng;
    JButton jButtonjia;
    JButton jButtonCE;

    int num1;
    int num2;

    String operator;

    //界面
    public Computer(){
        jPanelText = new JPanel();
        jButtonCE = new JButton("CE");
        textField = new JTextField(20);
        textField.setText("");
        textField.setEditable(true);
        jPanelText.add(textField);
        jPanelText.add(jButtonCE);
        jPanelButton = new JPanel(new GridLayout(4,4));
        jButton1 = new JButton("1");
        jButton1.addActionListener(buttonListener(jButton1.getText()));
        jButton2 = new JButton("2");
        jButton2.addActionListener(buttonListener(jButton2.getText()));
        jButton3 = new JButton("3");
        jButton3.addActionListener(buttonListener(jButton3.getText()));
        jButton4 = new JButton("4");
        jButton4.addActionListener(buttonListener(jButton4.getText()));
        jButton5 = new JButton("5");
        jButton5.addActionListener(buttonListener(jButton5.getText()));
        jButton6 = new JButton("6");
        jButton6.addActionListener(buttonListener(jButton6.getText()));
        jButton7 = new JButton("7");
        jButton7.addActionListener(buttonListener(jButton7.getText()));
        jButton8 = new JButton("8");
        jButton8.addActionListener(buttonListener(jButton8.getText()));
        jButton9 = new JButton("9");
        jButtonjian = new JButton("-");
        jButtonjian.addActionListener(optButtonListener(jButtonjian.getText()));
        jButtonjia = new JButton("+");
        jButtonjia.addActionListener(optButtonListener(jButtonjia.getText()));
        jButton9.addActionListener(buttonListener(jButton9.getText()));
        jButtoncheng = new JButton("*");
        jButtoncheng.addActionListener(optButtonListener(jButtoncheng.getText()));
        jButton0 = new JButton("0");
        jButton0.addActionListener(buttonListener(jButton0.getText()));
        jButtonchu = new JButton("/");
        jButtonchu.addActionListener(optButtonListener(jButtonchu.getText()));
        jButtondian = new JButton(".");
        jButtonCE.addActionListener(clearButtonListener());
        jButtondeng = new JButton("=");
        jButtondeng.addActionListener(optButtonListener(jButtondeng.getText()));
        jPanelButton.add(jButton7);jPanelButton.add(jButton8);jPanelButton.add(jButton9);jPanelButton.add(jButtonchu);
        jPanelButton.add(jButton4);jPanelButton.add(jButton5);jPanelButton.add(jButton6);jPanelButton.add(jButtoncheng);
        jPanelButton.add(jButton1);jPanelButton.add(jButton2);jPanelButton.add(jButton3);jPanelButton.add(jButtonjian);
        jPanelButton.add(jButtondian);jPanelButton.add(jButton0);jPanelButton.add(jButtondeng);jPanelButton.add(jButtonjia);

        operator = "";
        getContentPane().add("North",jPanelText);
        getContentPane().add("Center",jPanelButton);
    }

    // 数字监听器
    public ActionListener buttonListener(String text)
    {
        return new ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                MyLogger.logger.info(operator);
                MyLogger.logger.info(text);
                switch (operator)
                {
                    case "+":
                    case "-":
                    case "*":
                    case "/": textField.setText(text);break;
                    default:textField.setText(textField.getText()+text);break;
                }
            }
        };
    }

    //清除键监听器
    public ActionListener clearButtonListener()
    {
        return new ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                textField.setText("");
            }
        };
    }

    //加减乘除等号监听器
    public ActionListener optButtonListener(String Operation)
    {
        return new ActionListener()
        {
            @Override
            public void actionPerformed(ActionEvent e)
            {
                if (!Objects.equals(Operation, "="))
                {
                    num1 = Integer.parseInt(textField.getText());
                    textField.setText("");
                    operator = Operation;
                }
                else
                {
                    num2 = Integer.parseInt(textField.getText());
                    int result = 0;
                    switch (operator)
                    {
                        case "+": result = num1 + num2; break;
                        case "-": result = num1 - num2; break;
                        case "*": result = num1 * num2; break;
                        case "/": result = num1 / num2; break;
                    }
                    MyLogger.getLogger().info(String.valueOf(num1) + operator + num2 + " = " + result);
                    textField.setText(String.valueOf(result));
                }
            }
        };
    }
    public static void main(String[] args) {
        Computer Jisuanqi = new Computer();
        Jisuanqi.setTitle("计算器");
        Jisuanqi.setVisible(true);
        Jisuanqi.pack();
        Jisuanqi.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        Jisuanqi.setSize(300,300);
        Jisuanqi.setLocation(400, 300);
        Jisuanqi.setResizable(false);
    }
}

import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.logging.*;

/**
 * 可以自已定义日志打印格式，这样看起来比较方便些
 *
 */
class MyFormatter extends Formatter
{
    @Override
    public String format(LogRecord arg0)
    {
        //创建StringBuilder对象来存放后续需要打印的日志内容
        StringBuilder builder = new StringBuilder();

        //获取时间
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss.SSS");
        Date now = new Date();
        String dateStr = simpleDateFormat.format(now);

        builder.append("[");
        builder.append(dateStr);
        builder.append(" ");

        //拼接日志级别
        builder.append(arg0.getLevel()).append(" ");

        builder.append(arg0.getSourceClassName()).append(" ");

        //拼接方法名
        builder.append(arg0.getSourceMethodName()).append(" ");

        StackTraceElement[] stackTrace = Thread.currentThread().getStackTrace();
        String line = stackTrace[8].toString();
        String lineNumber = line.substring(line.indexOf(":") + 1, line.length() - 1);

        //拼接方法名
        builder.append(lineNumber).append("] ");

        //拼接日志内容
        builder.append(arg0.getMessage());

        //日志换行
        builder.append("\r\n");

        return builder.toString();
    }
}

public class MyLogger {
    static Logger logger;

    static  {
        logger = Logger.getLogger(MyLogger.class.getName());
        logger.setUseParentHandlers(false);
        //如果需要将日志文件写到文件系统中，需要创建一个FileHandler对象
        Handler consoleHandler = new ConsoleHandler();

        //创建日志格式文件：本次采用自定义的Formatter
        consoleHandler.setFormatter(new MyFormatter());

        //将FileHandler对象添加到Logger对象中
        logger.addHandler(consoleHandler);
    }

    public static Logger getLogger() {
        return logger;
    }

    public static void main(String[] args) {
        logger.info("11");
    }
}

运行效果：