java设计一个计算器窗口，尝试完成该计算器窗口的代码

好的，以下是一个简单的计算器窗口的Java代码示例：

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

public class Calculator extends JFrame {
    private JTextField textField;
    private JButton[] buttons;
    private String[] buttonLabels = {
            "7", "8", "9", "+",
            "4", "5", "6", "-",
            "1", "2", "3", "*",
            "0", ".", "=", "/"
    };

    private double result = 0;
    private String operator = "";
    private boolean startOfNumber = true;

    public Calculator() {
        setTitle("Calculator");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(300, 300);

        textField = new JTextField(20);
        textField.setHorizontalAlignment(JTextField.RIGHT);
        textField.setEditable(false);

        JPanel buttonPanel = new JPanel();
        buttonPanel.setLayout(new GridLayout(4, 4));

        buttons = new JButton[buttonLabels.length];
        for (int i = 0; i < buttons.length; i++) {
            buttons[i] = new JButton(buttonLabels[i]);
            buttons[i].addActionListener(e -> buttonClicked(e.getActionCommand()));
            buttonPanel.add(buttons[i]);
        }

        add(textField, BorderLayout.NORTH);
        add(buttonPanel, BorderLayout.CENTER);
        setVisible(true);
    }

    private void buttonClicked(String label) {
        if ("0123456789.".indexOf(label) >= 0) {
            if (startOfNumber) {
                textField.setText(label);
            } else {
                textField.setText(textField.getText() + label);
            }
            startOfNumber = false;
        } else {
            if (startOfNumber && "-".equals(label)) {
                textField.setText(label);
                startOfNumber = false;
            } else {
                if (!startOfNumber) {
                    double number = Double.parseDouble(textField.getText());
                    if ("+".equals(operator)) {
                        result += number;
                    } else if ("-".equals(operator)) {
                        result -= number;
                    } else if ("*".equals(operator)) {
                        result *= number;
                    } else if ("/".equals(operator)) {
                        result /= number;
                    } else if ("=".equals(operator)) {
                        result = number;
                    }
                    textField.setText("" + result);
                }
                operator = label;
                startOfNumber = true;
            }
        }
    }

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

这个计算器窗口使用了Java Swing库来创建GUI组件，包括文本框和按钮。每个按钮都有一个标签，当用户单击它时，计算器会执行相应的操作。在此示例中，计算器可以执行加、减、乘、除和等于操作，并且可以输入数字和小数点。