javaswing计算器

好的，下面是一个简单的 Java Swing 计算器示例：

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

public class Calculator extends JFrame implements ActionListener {

    // 创建界面组件
    private JTextField textField;
    private JButton button0, button1, button2, button3, button4, button5, button6, button7, button8, button9;
    private JButton buttonAdd, buttonSubtract, buttonMultiply, buttonDivide, buttonEqual, buttonClear;

    // 记录计算结果和当前操作数
    private double result = 0;
    private double currentNumber = 0;
    private String operator = "";

    public Calculator() {
        // 设置窗口标题和大小
        setTitle("Calculator");
        setSize(300, 350);
        setResizable(false);

        // 创建界面组件
        textField = new JTextField();
        textField.setEditable(false);
        textField.setHorizontalAlignment(JTextField.RIGHT);

        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");

        // 设置组件位置和大小
        textField.setBounds(10, 20, 270, 50);

        button7.setBounds(10, 80, 50, 50);
        button8.setBounds(70, 80, 50, 50);
        button9.setBounds(130, 80, 50, 50);
        buttonDivide.setBounds(190, 80, 50, 50);

        button4.setBounds(10, 140, 50, 50);
        button5.setBounds(70, 140, 50, 50);
        button6.setBounds(130, 140, 50, 50);
        buttonMultiply.setBounds(190, 140, 50, 50);

        button1.setBounds(10, 200, 50, 50);
        button2.setBounds(70, 200, 50, 50);
        button3.setBounds(130, 200, 50, 50);
        buttonSubtract.setBounds(190, 200, 50, 50);

        button0.setBounds(10, 260, 50, 50);
        buttonClear.setBounds(70, 260, 50, 50);
        buttonEqual.setBounds(130, 260, 50, 50);
        buttonAdd.setBounds(190, 260, 50, 50);

        // 添加组件到界面
        add(textField);

        add(button7);
        add(button8);
        add(button9);
        add(buttonDivide);

        add(button4);
        add(button5);
        add(button6);
        add(buttonMultiply);

        add(button1);
        add(button2);
        add(button3);
        add(buttonSubtract);

        add(button0);
        add(buttonClear);
        add(buttonEqual);
        add(buttonAdd);

        // 添加事件监听器
        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);

        // 设置窗口可见性
        setVisible(true);
    }

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

        if (command.equals("C")) {
            // 清空计算器
            result = 0;
            currentNumber = 0;
            operator = "";
            textField.setText("");
        } else if (command.equals("+")) {
            // 加法
            result += currentNumber;
            currentNumber = 0;
            operator = "+";
            textField.setText("");
        } else if (command.equals("-")) {
            // 减法
            result -= currentNumber;
            currentNumber = 0;
            operator = "-";
            textField.setText("");
        } else if (command.equals("*")) {
            // 乘法
            result *= currentNumber;
            currentNumber = 0;
            operator = "*";
            textField.setText("");
        } else if (command.equals("/")) {
            // 除法
            if (currentNumber == 0) {
                textField.setText("Error");
            } else {
                result /= currentNumber;
                currentNumber = 0;
                operator = "/";
                textField.setText("");
            }
        } else if (command.equals("=")) {
            // 等于号
            if (operator.equals("+")) {
                result += currentNumber;
            } else if (operator.equals("-")) {
                result -= currentNumber;
            } else if (operator.equals("*")) {
                result *= currentNumber;
            } else if (operator.equals("/")) {
                if (currentNumber == 0) {
                    textField.setText("Error");
                } else {
                    result /= currentNumber;
                }
            }
            currentNumber = result;
            operator = "";
            textField.setText(Double.toString(result));
        } else {
            // 数字键
            currentNumber = currentNumber * 10 + Double.parseDouble(command);
            textField.setText(Double.toString(currentNumber));
        }
    }

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

这个计算器支持加、减、乘、除和清空操作，并且可以处理连续操作，例如 `1 + 2 - 3 * 4 / 5`。你可以根据需要进行修改和扩展。