java构造窗口，动态实现加减乘除运算

好的，以下是一个使用Java Swing构建简单计算器窗口的示例代码，包括实现加减乘除四个运算的功能。

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

public class Calculator extends JFrame implements ActionListener {
    private JTextField number1, number2, result;
    private JButton addBtn, subtractBtn, multiplyBtn, divideBtn, clearBtn;

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

    public Calculator() {
        super("Calculator");

        JPanel inputPanel = new JPanel(new GridLayout(2, 2));
        number1 = new JTextField();
        number2 = new JTextField();
        inputPanel.add(new JLabel("Number 1:"));
        inputPanel.add(number1);
        inputPanel.add(new JLabel("Number 2:"));
        inputPanel.add(number2);

        JPanel buttonPanel = new JPanel(new GridLayout(1, 5));
        addBtn = new JButton("+");
        subtractBtn = new JButton("-");
        multiplyBtn = new JButton("*");
        divideBtn = new JButton("/");
        clearBtn = new JButton("C");
        addBtn.addActionListener(this);
        subtractBtn.addActionListener(this);
        multiplyBtn.addActionListener(this);
        divideBtn.addActionListener(this);
        clearBtn.addActionListener(this);
        buttonPanel.add(addBtn);
        buttonPanel.add(subtractBtn);
        buttonPanel.add(multiplyBtn);
        buttonPanel.add(divideBtn);
        buttonPanel.add(clearBtn);

        JPanel resultPanel = new JPanel(new GridLayout(1, 2));
        result = new JTextField();
        result.setEditable(false);
        resultPanel.add(new JLabel("Result:"));
        resultPanel.add(result);

        setLayout(new BorderLayout());
        add(inputPanel, BorderLayout.NORTH);
        add(buttonPanel, BorderLayout.CENTER);
        add(resultPanel, BorderLayout.SOUTH);

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);
        pack();
        setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        String str1 = number1.getText();
        String str2 = number2.getText();
        double n1 = Double.parseDouble(str1);
        double n2 = Double.parseDouble(str2);
        double res = 0;
        if (e.getSource() == addBtn) {
            res = n1 + n2;
        } else if (e.getSource() == subtractBtn) {
            res = n1 - n2;
        } else if (e.getSource() == multiplyBtn) {
            res = n1 * n2;
        } else if (e.getSource() == divideBtn) {
            res = n1 / n2;
        } else if (e.getSource() == clearBtn) {
            number1.setText("");
            number2.setText("");
            result.setText("");
            return;
        }
        result.setText(String.valueOf(res));
    }
}

这段代码会创建一个简单的计算器窗口，用户可以在文本框中输入两个数字，并通过点击按钮进行加减乘除四种运算。结果将显示在另一个文本框中。