用java实现一个图形用户界面类型的简单计算器

好的，以下是一个使用 Java Swing 实现的简单计算器 GUI：

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

public class CalculatorGUI extends JFrame implements ActionListener {
    private JTextField num1Field, num2Field, resultField;
    private JButton addButton, subtractButton, multiplyButton, divideButton;

    public CalculatorGUI() {
        setTitle("简单计算器");
        setSize(300, 200);
        setLocationRelativeTo(null);

        // 创建输入框和标签
        JLabel num1Label = new JLabel("第一个数");
        num1Field = new JTextField(10);
        JLabel num2Label = new JLabel("第二个数");
        num2Field = new JTextField(10);
        JLabel resultLabel = new JLabel("结果");
        resultField = new JTextField(10);
        resultField.setEditable(false);

        // 创建按钮
        addButton = new JButton("+");
        addButton.addActionListener(this);
        subtractButton = new JButton("-");
        subtractButton.addActionListener(this);
        multiplyButton = new JButton("*");
        multiplyButton.addActionListener(this);
        divideButton = new JButton("/");
        divideButton.addActionListener(this);

        // 创建面板
        JPanel inputPanel = new JPanel(new GridLayout(3, 2));
        inputPanel.add(num1Label);
        inputPanel.add(num1Field);
        inputPanel.add(num2Label);
        inputPanel.add(num2Field);
        inputPanel.add(resultLabel);
        inputPanel.add(resultField);

        JPanel buttonPanel = new JPanel(new FlowLayout());
        buttonPanel.add(addButton);
        buttonPanel.add(subtractButton);
        buttonPanel.add(multiplyButton);
        buttonPanel.add(divideButton);

        // 添加面板
        setLayout(new BorderLayout());
        add(inputPanel, BorderLayout.CENTER);
        add(buttonPanel, BorderLayout.SOUTH);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == addButton) {
            double num1 = Double.parseDouble(num1Field.getText());
            double num2 = Double.parseDouble(num2Field.getText());
            double result = num1 + num2;
            resultField.setText(String.valueOf(result));
        } else if (e.getSource() == subtractButton) {
            double num1 = Double.parseDouble(num1Field.getText());
            double num2 = Double.parseDouble(num2Field.getText());
            double result = num1 - num2;
            resultField.setText(String.valueOf(result));
        } else if (e.getSource() == multiplyButton) {
            double num1 = Double.parseDouble(num1Field.getText());
            double num2 = Double.parseDouble(num2Field.getText());
            double result = num1 * num2;
            resultField.setText(String.valueOf(result));
        } else if (e.getSource() == divideButton) {
            double num1 = Double.parseDouble(num1Field.getText());
            double num2 = Double.parseDouble(num2Field.getText());
            if (num2 == 0) {
                resultField.setText("除数不能为0！");
            } else {
                double result = num1 / num2;
                resultField.setText(String.valueOf(result));
            }
        }
    }

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

这个计算器 GUI 包含两个文本框用于输入数值，一个文本框用于显示结果，以及四个按钮用于进行加减乘除四则运算。当用户点击某个按钮时，程序会根据对应的运算符计算结果并显示在结果文本框中。