用Java的gui简易计算器

好的，以下是一个简单的Java GUI计算器的示例代码：

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

public class Calculator extends JFrame implements ActionListener {
    private JTextField textField;
    private JButton[] numberButtons = new JButton[10];
    private JButton[] functionButtons = new JButton[8];
    private JButton addButton, subButton, mulButton, divButton;
    private JButton decButton, equButton, delButton, clrButton;
    private JPanel panel;

    private Font font = new Font("Verdana", Font.BOLD, 18);

    private double num1 = 0, num2 = 0, result = 0;
    private char operator;

    public Calculator() {
        setTitle("Calculator");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(330, 450);
        setResizable(false);

        textField = new JTextField();
        textField.setBounds(0, 0, 320, 50);
        textField.setFont(font);
        textField.setEditable(false);

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

        addButton = new JButton("+");
        subButton = new JButton("-");
        mulButton = new JButton("*");
        divButton = new JButton("/");
        decButton = new JButton(".");
        equButton = new JButton("=");
        delButton = new JButton("Del");
        clrButton = new JButton("Clr");

        functionButtons[0] = addButton;
        functionButtons[1] = subButton;
        functionButtons[2] = mulButton;
        functionButtons[3] = divButton;
        functionButtons[4] = decButton;
        functionButtons[5] = equButton;
        functionButtons[6] = delButton;
        functionButtons[7] = clrButton;

        for (int i = 0; i < 8; i++) {
            functionButtons[i].addActionListener(this);
            functionButtons[i].setFont(font);
        }

        panel = new JPanel();
        panel.setBounds(0, 50, 320, 400);
        panel.setLayout(new GridLayout(5, 4, 10, 10));
        panel.add(delButton);
        panel.add(clrButton);
        panel.add(functionButtons[0]);
        panel.add(numberButtons[7]);
        panel.add(numberButtons[8]);
        panel.add(numberButtons[9]);
        panel.add(functionButtons[1]);
        panel.add(numberButtons[4]);
        panel.add(numberButtons[5]);
        panel.add(numberButtons[6]);
        panel.add(functionButtons[2]);
        panel.add(numberButtons[1]);
        panel.add(numberButtons[2]);
        panel.add(numberButtons[3]);
        panel.add(functionButtons[3]);
        panel.add(decButton);
        panel.add(numberButtons[0]);
        panel.add(equButton);

        add(textField);
        add(panel);

        setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        for (int i = 0; i < 10; i++) {
            if (e.getSource() == numberButtons[i]) {
                textField.setText(textField.getText().concat(String.valueOf(i)));
            }
        }

        if (e.getSource() == decButton) {
            textField.setText(textField.getText().concat("."));
        }

        if (e.getSource() == addButton) {
            num1 = Double.parseDouble(textField.getText());
            operator = '+';
            textField.setText("");
        }

        if (e.getSource() == subButton) {
            num1 = Double.parseDouble(textField.getText());
            operator = '-';
            textField.setText("");
        }

        if (e.getSource() == mulButton) {
            num1 = Double.parseDouble(textField.getText());
            operator = '*';
            textField.setText("");
        }

        if (e.getSource() == divButton) {
            num1 = Double.parseDouble(textField.getText());
            operator = '/';
            textField.setText("");
        }

        if (e.getSource() == equButton) {
            num2 = Double.parseDouble(textField.getText());

            switch (operator) {
                case '+':
                    result = num1 + num2;
                    break;
                case '-':
                    result = num1 - num2;
                    break;
                case '*':
                    result = num1 * num2;
                    break;
                case '/':
                    result = num1 / num2;
                    break;
            }

            textField.setText(String.valueOf(result));
            num1 = result;
        }

        if (e.getSource() == clrButton) {
            textField.setText("");
        }

        if (e.getSource() == delButton) {
            String str = textField.getText();
            textField.setText("");

            for (int i = 0; i < str.length() - 1; i++) {
                textField.setText(textField.getText() + str.charAt(i));
            }
        }
    }

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

该计算器具有基本的加减乘除和小数点功能，以及清除和删除按钮。您可以根据需要进行修改和扩展。