用java语言写一个图形界面化计算器

好的，以下是一个简单的Java图形界面计算器的代码：

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[] buttons;
    private String[] buttonLabels = { "7", "8", "9", "/", "4", "5", "6", "*", "1", "2", "3", "-", "0", ".", "=", "+" };
    private JPanel buttonPanel;

    private double num1, num2;
    private String operator;

    public Calculator() {
        super("Calculator");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        displayField = new JTextField(30);
        displayField.setEditable(false);

        buttons = new JButton[buttonLabels.length];
        buttonPanel = new JPanel(new GridLayout(4, 4));

        for (int i = 0; i < buttonLabels.length; i++) {
            buttons[i] = new JButton(buttonLabels[i]);
            buttons[i].addActionListener(this);
            buttonPanel.add(buttons[i]);
        }

        getContentPane().add(displayField, BorderLayout.NORTH);
        getContentPane().add(buttonPanel, BorderLayout.CENTER);

        pack();
        setVisible(true);
    }

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

        if (command.matches("[0-9]+")) {
            displayField.setText(displayField.getText() + command);
        } else if (command.equals(".")) {
            if (!displayField.getText().contains(".")) {
                displayField.setText(displayField.getText() + ".");
            }
        } else if (command.matches("[+\\-*/=]")) {
            if (operator == null) {
                num1 = Double.parseDouble(displayField.getText());
                operator = command;
                displayField.setText("");
            } else {
                num2 = Double.parseDouble(displayField.getText());
                switch (operator) {
                case "+":
                    num1 += num2;
                    break;
                case "-":
                    num1 -= num2;
                    break;
                case "*":
                    num1 *= num2;
                    break;
                case "/":
                    num1 /= num2;
                    break;
                }
                if (command.equals("=")) {
                    displayField.setText("" + num1);
                    operator = null;
                } else {
                    operator = command;
                    displayField.setText("");
                }
            }
        }
    }

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

希望这个代码能够帮到你！