java swing实现计算器程序

好的，以下是一个简单的 Java Swing 计算器程序示例：

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

public class Calculator extends JFrame implements ActionListener {

    private static final long serialVersionUID = 1L;
    private JTextField inputField;
    private JButton button0, button1, button2, button3, button4,
            button5, button6, button7, button8, button9, buttonAdd,
            buttonSubtract, buttonMultiply, buttonDivide, buttonEqual,
            buttonClear;

    private double num1, num2;
    private int operator;

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

        // 初始化控件
        inputField = new JTextField(20);
        inputField.setEditable(false);

        button0 = new JButton("0");
        button1 = new JButton("1");
        button2 = new JButton("2");
        button3 = new JButton("3");
        button4 = new JButton("4");
        button5 = new JButton("5");
        button6 = new JButton("6");
        button7 = new JButton("7");
        button8 = new JButton("8");
        button9 = new JButton("9");
        buttonAdd = new JButton("+");
        buttonSubtract = new JButton("-");
        buttonMultiply = new JButton("*");
        buttonDivide = new JButton("/");
        buttonEqual = new JButton("=");
        buttonClear = new JButton("C");

        // 添加按钮点击事件监听器
        button0.addActionListener(this);
        button1.addActionListener(this);
        button2.addActionListener(this);
        button3.addActionListener(this);
        button4.addActionListener(this);
        button5.addActionListener(this);
        button6.addActionListener(this);
        button7.addActionListener(this);
        button8.addActionListener(this);
        button9.addActionListener(this);
        buttonAdd.addActionListener(this);
        buttonSubtract.addActionListener(this);
        buttonMultiply.addActionListener(this);
        buttonDivide.addActionListener(this);
        buttonEqual.addActionListener(this);
        buttonClear.addActionListener(this);

        // 添加控件到面板
        JPanel panel = new JPanel();
        panel.setLayout(new GridLayout(4, 4));
        panel.add(button7);
        panel.add(button8);
        panel.add(button9);
        panel.add(buttonDivide);
        panel.add(button4);
        panel.add(button5);
        panel.add(button6);
        panel.add(buttonMultiply);
        panel.add(button1);
        panel.add(button2);
        panel.add(button3);
        panel.add(buttonSubtract);
        panel.add(button0);
        panel.add(buttonClear);
        panel.add(buttonEqual);
        panel.add(buttonAdd);

        Container container = getContentPane();
        container.setLayout(new BorderLayout());
        container.add(inputField, BorderLayout.NORTH);
        container.add(panel, BorderLayout.CENTER);

        setSize(300, 250);
        setLocationRelativeTo(null);
        setResizable(false);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == button0) {
            inputField.setText(inputField.getText() + "0");
        } else if (e.getSource() == button1) {
            inputField.setText(inputField.getText() + "1");
        } else if (e.getSource() == button2) {
            inputField.setText(inputField.getText() + "2");
        } else if (e.getSource() == button3) {
            inputField.setText(inputField.getText() + "3");
        } else if (e.getSource() == button4) {
            inputField.setText(inputField.getText() + "4");
        } else if (e.getSource() == button5) {
            inputField.setText(inputField.getText() + "5");
        } else if (e.getSource() == button6) {
            inputField.setText(inputField.getText() + "6");
        } else if (e.getSource() == button7) {
            inputField.setText(inputField.getText() + "7");
        } else if (e.getSource() == button8) {
            inputField.setText(inputField.getText() + "8");
        } else if (e.getSource() == button9) {
            inputField.setText(inputField.getText() + "9");
        } else if (e.getSource() == buttonAdd) {
            num1 = Double.parseDouble(inputField.getText());
            operator = 1;
            inputField.setText("");
        } else if (e.getSource() == buttonSubtract) {
            num1 = Double.parseDouble(inputField.getText());
            operator = 2;
            inputField.setText("");
        } else if (e.getSource() == buttonMultiply) {
            num1 = Double.parseDouble(inputField.getText());
            operator = 3;
            inputField.setText("");
        } else if (e.getSource() == buttonDivide) {
            num1 = Double.parseDouble(inputField.getText());
            operator = 4;
            inputField.setText("");
        } else if (e.getSource() == buttonEqual) {
            num2 = Double.parseDouble(inputField.getText());
            switch (operator) {
                case 1:
                    inputField.setText(String.valueOf(num1 + num2));
                    break;
                case 2:
                    inputField.setText(String.valueOf(num1 - num2));
                    break;
                case 3:
                    inputField.setText(String.valueOf(num1 * num2));
                    break;
                case 4:
                    inputField.setText(String.valueOf(num1 / num2));
                    break;
            }
        } else if (e.getSource() == buttonClear) {
            inputField.setText("");
        }
    }

    public static void main(String[] args) {
        Calculator calculator = new Calculator();
        calculator.setVisible(true);
    }

}

这个程序包含了数字、运算符和清除操作按钮，以及文本框用于显示计算结果。当用户点击数字按钮时，数字将显示在文本框中，当用户点击运算符按钮时，程序将记录第一个数值并保存运算符类型，然后清空文本框，以便用户输入第二个数值。当用户点击“=”按钮时，程序将执行相应的运算并将结果显示在文本框中。当用户点击“C”按钮时，程序将清空文本框中的内容。