请你帮我用java语言写一个计算器，带有窗口

好的，下面是一个简单的 Java 计算器程序，带有窗口界面，可以进行加、减、乘、除四种基本运算：

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

public class CalculatorGUI extends JFrame implements ActionListener {
    private JLabel labelNum1, labelNum2, labelResult;
    private JTextField textFieldNum1, textFieldNum2, textFieldResult;
    private JButton buttonAdd, buttonSubtract, buttonMultiply, buttonDivide;

    public CalculatorGUI() {
        setTitle("计算器");
        setSize(300, 200);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);

        labelNum1 = new JLabel("第一个数字：");
        labelNum2 = new JLabel("第二个数字：");
        labelResult = new JLabel("计算结果：");

        textFieldNum1 = new JTextField(10);
        textFieldNum2 = new JTextField(10);
        textFieldResult = new JTextField(10);
        textFieldResult.setEditable(false);

        buttonAdd = new JButton("+");
        buttonSubtract = new JButton("-");
        buttonMultiply = new JButton("*");
        buttonDivide = new JButton("/");

        buttonAdd.addActionListener(this);
        buttonSubtract.addActionListener(this);
        buttonMultiply.addActionListener(this);
        buttonDivide.addActionListener(this);

        JPanel panelInput = new JPanel(new GridLayout(2, 2));
        panelInput.add(labelNum1);
        panelInput.add(textFieldNum1);
        panelInput.add(labelNum2);
        panelInput.add(textFieldNum2);

        JPanel panelButtons = new JPanel(new GridLayout(1, 4));
        panelButtons.add(buttonAdd);
        panelButtons.add(buttonSubtract);
        panelButtons.add(buttonMultiply);
        panelButtons.add(buttonDivide);

        JPanel panelOutput = new JPanel(new GridLayout(1, 2));
        panelOutput.add(labelResult);
        panelOutput.add(textFieldResult);

        JPanel panelMain = new JPanel(new GridLayout(3, 1));
        panelMain.add(panelInput);
        panelMain.add(panelButtons);
        panelMain.add(panelOutput);

        add(panelMain);

        setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        double num1 = Double.parseDouble(textFieldNum1.getText());
        double num2 = Double.parseDouble(textFieldNum2.getText());

        double result = 0.0;

        if (e.getSource() == buttonAdd) {
            result = num1 + num2;
        } else if (e.getSource() == buttonSubtract) {
            result = num1 - num2;
        } else if (e.getSource() == buttonMultiply) {
            result = num1 * num2;
        } else if (e.getSource() == buttonDivide) {
            if (num2 == 0) {
                JOptionPane.showMessageDialog(null, "除数不能为0", "错误", JOptionPane.ERROR_MESSAGE);
                return;
            }
            result = num1 / num2;
        }

        textFieldResult.setText(String.valueOf(result));
    }

    public static void main(String[] args) {
        new CalculatorGUI();
    }
}

运行程序后，它会打开一个窗口界面，在界面中输入两个数字和一个运算符，然后点击计算按钮，输出计算结果。如果除数为0，则会弹出一个错误提示窗口。