java编写一个计算器带窗口

以下是Java编写一个带窗口的计算器的示例代码：

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

public class Calculator extends JFrame implements ActionListener {
    private JTextField firstNumField, secondNumField, resultField;
    private JButton addButton, subtractButton, multiplyButton, divideButton;

    public Calculator() {
        super("计算器");
        setLayout(new FlowLayout());

        // 添加第一个文本框
        firstNumField = new JTextField(10);
        add(firstNumField);

        // 添加加号按钮
        addButton = new JButton("+");
        addButton.addActionListener(this);
        add(addButton);

        // 添加减号按钮
        subtractButton = new JButton("-");
        subtractButton.addActionListener(this);
        add(subtractButton);

        // 添加乘号按钮
        multiplyButton = new JButton("*");
        multiplyButton.addActionListener(this);
        add(multiplyButton);

        // 添加除号按钮
        divideButton = new JButton("/");
        divideButton.addActionListener(this);
        add(divideButton);

        // 添加第二个文本框
        secondNumField = new JTextField(10);
        add(secondNumField);

        // 添加等号按钮
        JButton equalsButton = new JButton("=");
        equalsButton.addActionListener(this);
        add(equalsButton);

        // 添加结果文本框
        resultField = new JTextField(10);
        resultField.setEditable(false);
        add(resultField);

        setSize(200, 200);
        setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        double firstNum = Double.parseDouble(firstNumField.getText());
        double secondNum = Double.parseDouble(secondNumField.getText());
        double result = 0;

        if (e.getSource() == addButton) {
            result = firstNum + secondNum;
        } else if (e.getSource() == subtractButton) {
            result = firstNum - secondNum;
        } else if (e.getSource() == multiplyButton) {
            result = firstNum * secondNum;
        } else if (e.getSource() == divideButton) {
            result = firstNum / secondNum;
        }

        resultField.setText(Double.toString(result));
    }

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