用java swing组件实现一个简单的计算器，写出代码

好的，我可以回答这个问题。以下是一个简单的Java Swing计算器的代码示例：

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

public class Calculator extends JFrame implements ActionListener {

    private JTextField textField;
    private JButton[] buttons;
    private String[] buttonLabels = {"7", "8", "9", "/", "4", "5", "6", "*", "1", "2", "3", "-", "0", ".", "=", "+"};
    private double num1, num2, result;
    private String operator;

    public Calculator() {
        setTitle("Calculator");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setResizable(false);

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

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

        buttons = new JButton[16];
        for (int i = 0; i < 16; i++) {
            buttons[i] = new JButton(buttonLabels[i]);
            buttons[i].addActionListener(this);
            buttonPanel.add(buttons[i]);
        }

        getContentPane().add(textField, BorderLayout.NORTH);
        getContentPane().add(buttonPanel, BorderLayout.CENTER);

        pack();
        setLocationRelativeTo(null);
        setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        String label = e.getActionCommand();

        if (label.equals("C")) {
            textField.setText("");
        } else if (label.equals("+/-")) {
            double value = Double.parseDouble(textField.getText());
            value = -value;
            textField.setText(Double.toString(value));
        } else if (label.equals("%")) {
            double value = Double.parseDouble(textField.getText());
            value = value / 100;
            textField.setText(Double.toString(value));
        } else if (label.equals("/") || label.equals("*") || label.equals("-") || label.equals("+")) {
            num1 = Double.parseDouble(textField.getText());
            operator = label;
            textField.setText("");
        } else if (label.equals("=")) {
            num2 = Double.parseDouble(textField.getText());
            if (operator.equals("/")) {
                result = num1 / num2;
            } else if (operator.equals("*")) {
                result = num1 * num2;
            } else if (operator.equals("-")) {
                result = num1 - num2;
            } else if (operator.equals("+")) {
                result = num1 + num2;
            }
            textField.setText(Double.toString(result));
        } else {
            textField.setText(textField.getText() + label);
        }
    }

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

这个计算器使用了Java Swing组件来创建一个简单的GUI界面。它包括一个文本框和16个按钮，可以进行基本的加、减、乘、除、百分比和正负号计算。