eclipse简易计算器java

以下是一个简易的Java计算器程序示例，使用Eclipse进行开发：

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 displayField;
    private JButton[] numberButtons;
    private JButton[] operatorButtons;
    private JButton equalsButton;
    private JButton clearButton;
    private double num1, num2, result;
    private String operator;

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

        displayField = new JTextField();
        displayField.setHorizontalAlignment(JTextField.RIGHT);
        displayField.setEditable(false);
        add(displayField, BorderLayout.NORTH);

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

        numberButtons = new JButton[10];
        for (int i = 0; i < 10; i++) {
            numberButtons[i] = new JButton(String.valueOf(i));
            numberButtons[i].addActionListener(this);
            buttonPanel.add(numberButtons[i]);
        }

        operatorButtons = new JButton[4];
        operatorButtons[0] = new JButton("+");
        operatorButtons[1] = new JButton("-");
        operatorButtons[2] = new JButton("*");
        operatorButtons[3] = new JButton("/");
        for (int i = 0; i < 4; i++) {
            operatorButtons[i].addActionListener(this);
            buttonPanel.add(operatorButtons[i]);
        }

        equalsButton = new JButton("=");
        equalsButton.addActionListener(this);
        buttonPanel.add(equalsButton);

        clearButton = new JButton("C");
        clearButton.addActionListener(this);
        buttonPanel.add(clearButton);

        add(buttonPanel, BorderLayout.CENTER);

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

    public void actionPerformed(ActionEvent e) {
        Object source = e.getSource();

        if (source == clearButton) {
            displayField.setText("");        } else if (source == equalsButton) {
            num2 = Double.parseDouble(displayField.getText());
            switch (operator) {
                case "+":
                    result = num1 + num2;
                    break;
                case "-":
                    result = num1 - num2;
                    break;
                case "*":
                    result = num1 * num2;
                    break;
                case "/":
                    result = num1 / num2;
                    break;
            }
            displayField.setText(String.valueOf(result));
        } else {
            for (int i = 0; i < 10; i++) {
                if (source == numberButtons[i]) {
                    displayField.setText(displayField.getText() + i);
                    break;
                }
            }
            for (int i = 0; i < 4; i++) {
                if (source == operatorButtons[i]) {
                    num1 = Double.parseDouble(displayField.getText());
                    operator = operatorButtons[i].getText();
                    displayField.setText("");
                    break;
                }
            }
        }
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                new Calculator();
            }
        });
    }
}