【JAVA】实现的一个简单计算器

r囧r小猫 2024-02-05 15:03 42阅读 0赞

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：**

![d1dbc81cc4f54803a8bfcf1e68d4448d.png][]

[d1dbc81cc4f54803a8bfcf1e68d4448d.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/05/8090ad673a8b4164927aa8274d33a862.png