基于swing的计算器带注释

好的，以下是一个基于Swing的简单计算器示例代码，带有注释说明：

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

public class Calculator implements ActionListener {

    // 声明计算器面板和按钮
    JFrame frame;
    JTextField textField;
    JButton[] numberButtons = new JButton[10];
    JButton[] functionButtons = new JButton[8];
    JButton addButton, subButton, mulButton, divButton;
    JButton decButton, equButton, delButton, clrButton;

    // 声明计算器变量
    double num1 = 0, num2 = 0, result = 0;
    char operator;

    // 构造函数
    Calculator() {

        // 创建计算器面板
        frame = new JFrame("Calculator");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(420, 550);
        frame.setLayout(null);

        // 创建文本框
        textField = new JTextField();
        textField.setBounds(50, 25, 300, 50);
        textField.setFont(new Font("Arial", Font.PLAIN, 32));
        textField.setEditable(false);

        // 创建数字按钮
        for (int i = 0; i < 10; i++) {
            numberButtons[i] = new JButton(String.valueOf(i));
            numberButtons[i].addActionListener(this);
        }

        // 创建功能按钮
        addButton = new JButton("+");
        subButton = new JButton("-");
        mulButton = new JButton("*");
        divButton = new JButton("/");
        decButton = new JButton(".");
        equButton = new JButton("=");
        delButton = new JButton("Delete");
        clrButton = new JButton("Clear");

        functionButtons[0] = addButton;
        functionButtons[1] = subButton;
        functionButtons[2] = mulButton;
        functionButtons[3] = divButton;
        functionButtons[4] = decButton;
        functionButtons[5] = equButton;
        functionButtons[6] = delButton;
        functionButtons[7] = clrButton;

        for (int i = 0; i < 8; i++) {
            functionButtons[i].addActionListener(this);
            functionButtons[i].setFont(new Font("Arial", Font.PLAIN, 18));
        }

        // 设置按钮位置
        addButton.setBounds(250, 100, 100, 50);
        subButton.setBounds(250, 170, 100, 50);
        mulButton.setBounds(250, 240, 100, 50);
        divButton.setBounds(250, 310, 100, 50);
        decButton.setBounds(60, 430, 100, 50);
        equButton.setBounds(170, 430, 100, 50);
        delButton.setBounds(280, 430, 100, 50);
        clrButton.setBounds(170, 370, 100, 50);

        // 设置数字按钮位置
        for (int i = 0; i < 10; i++) {
            numberButtons[i].setFont(new Font("Arial", Font.PLAIN, 18));
        }

        numberButtons[0].setBounds(60, 100, 100, 50);
        numberButtons[1].setBounds(60, 170, 100, 50);
        numberButtons[2].setBounds(60, 240, 100, 50);
        numberButtons[3].setBounds(60, 310, 100, 50);
        numberButtons[4].setBounds(170, 100, 100, 50);
        numberButtons[5].setBounds(170, 170, 100, 50);
        numberButtons[6].setBounds(170, 240, 100, 50);
        numberButtons[7].setBounds(170, 310, 100, 50);
        numberButtons[8].setBounds(60, 380, 100, 50);
        numberButtons[9].setBounds(170, 380, 100, 50);

        // 将组件添加到面板
        frame.add(textField);
        frame.add(addButton);
        frame.add(subButton);
        frame.add(mulButton);
        frame.add(divButton);
        frame.add(decButton);
        frame.add(equButton);
        frame.add(delButton);
        frame.add(clrButton);

        for (int i = 0; i < 10; i++) {
            frame.add(numberButtons[i]);
        }

        // 显示计算器
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        Calculator calculator = new Calculator();
    }

    // 处理按钮事件
    @Override
    public void actionPerformed(ActionEvent e) {
        for (int i = 0; i < 10; i++) {
            if (e.getSource() == numberButtons[i]) {
                textField.setText(textField.getText() + String.valueOf(i));
            }
        }

        if (e.getSource() == decButton) {
            textField.setText(textField.getText() + ".");
        }

        if (e.getSource() == addButton) {
            num1 = Double.parseDouble(textField.getText());
            operator = '+';
            textField.setText("");
        }

        if (e.getSource() == subButton) {
            num1 = Double.parseDouble(textField.getText());
            operator = '-';
            textField.setText("");
        }

        if (e.getSource() == mulButton) {
            num1 = Double.parseDouble(textField.getText());
            operator = '*';
            textField.setText("");
        }

        if (e.getSource() == divButton) {
            num1 = Double.parseDouble(textField.getText());
            operator = '/';
            textField.setText("");
        }

        if (e.getSource() == equButton) {
            num2 = Double.parseDouble(textField.getText());

            switch (operator) {
                case '+':
                    result = num1 + num2;
                    break;

                case '-':
                    result = num1 - num2;
                    break;

                case '*':
                    result = num1 * num2;
                    break;

                case '/':
                    result = num1 / num2;
                    break;
            }

            textField.setText(String.valueOf(result));
            num1 = result;
        }

        if (e.getSource() == clrButton) {
            textField.setText("");
        }

        if (e.getSource() == delButton) {
            String string = textField.getText();
            textField.setText("");
            for (int i = 0; i < string.length() - 1; i++) {
                textField.setText(textField.getText() + string.charAt(i));
            }
        }
    }
}

以上代码实现了一个基于Swing的简单计算器，包括数字按钮、加减乘除按钮、小数点按钮、清空按钮、删除按钮和等号按钮。在按钮事件处理函数中，使用switch语句实现了四则运算的逻辑。在界面设计中，使用了绝对布局和字体设置等功能。