使用java的gui编写计算器框架

以下是一个简单的 Java GUI 计算器框架的示例代码：

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

public class Calculator extends JFrame implements ActionListener {
    
    private JLabel label;
    private JTextField textField;
    private JButton button0, button1, button2, button3, button4, button5, button6, button7, button8, button9, buttonPlus, buttonMinus, buttonMultiply, buttonDivide, buttonEqual, buttonClear;
    
    private double num1 = 0, num2 = 0, result = 0;
    private char operator = '+';
    
    public Calculator() {
        setTitle("Calculator");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(300, 250);
        
        label = new JLabel("0");
        label.setHorizontalAlignment(JLabel.RIGHT);
        label.setFont(new Font("Arial", Font.PLAIN, 18));
        
        textField = new JTextField("");
        textField.setEditable(false);
        textField.setHorizontalAlignment(JTextField.RIGHT);
        textField.setFont(new Font("Arial", Font.PLAIN, 18));
        
        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");
        buttonPlus = new JButton("+");
        buttonMinus = new JButton("-");
        buttonMultiply = new JButton("*");
        buttonDivide = new JButton("/");
        buttonEqual = new JButton("=");
        buttonClear = new JButton("C");
        
        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);
        buttonPlus.addActionListener(this);
        buttonMinus.addActionListener(this);
        buttonMultiply.addActionListener(this);
        buttonDivide.addActionListener(this);
        buttonEqual.addActionListener(this);
        buttonClear.addActionListener(this);
        
        JPanel p1 = new JPanel();
        p1.setLayout(new GridLayout(2, 1));
        p1.add(label);
        p1.add(textField);
        
        JPanel p2 = new JPanel();
        p2.setLayout(new GridLayout(4, 4));
        p2.add(button7);
        p2.add(button8);
        p2.add(button9);
        p2.add(buttonDivide);
        p2.add(button4);
        p2.add(button5);
        p2.add(button6);
        p2.add(buttonMultiply);
        p2.add(button1);
        p2.add(button2);
        p2.add(button3);
        p2.add(buttonMinus);
        p2.add(button0);
        p2.add(buttonClear);
        p2.add(buttonEqual);
        p2.add(buttonPlus);
        
        add(p1, BorderLayout.NORTH);
        add(p2, BorderLayout.CENTER);
        
        setVisible(true);
    }
    
    public void actionPerformed(ActionEvent e) {
        String input = e.getActionCommand();
        
        if (input.equals("C")) {
            num1 = 0;
            num2 = 0;
            result = 0;
            operator = '+';
            label.setText("0");
            textField.setText("");
        } else if (input.equals("+")) {
            num1 = Double.parseDouble(textField.getText());
            operator = '+';
            textField.setText("");
        } else if (input.equals("-")) {
            num1 = Double.parseDouble(textField.getText());
            operator = '-';
            textField.setText("");
        } else if (input.equals("*")) {
            num1 = Double.parseDouble(textField.getText());
            operator = '*';
            textField.setText("");
        } else if (input.equals("/")) {
            num1 = Double.parseDouble(textField.getText());
            operator = '/';
            textField.setText("");
        } else if (input.equals("=")) {
            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;
            }
            
            label.setText(Double.toString(result));
            num1 = 0;
            num2 = 0;
            operator = '+';
            textField.setText("");
        } else {
            textField.setText(textField.getText() + input);
        }
    }
    
    public static void main(String[] args) {
        new Calculator();
    }
}

这个代码创建了一个名为“Calculator”的 JFrame 对象，并且添加了一个 JLabel 和一个 JTextField 用于显示结果和输入，以及一组 JButton 用于数字和操作符输入。在 actionPerformed() 方法中，我们对输入进行解析，并且在必要的时候更新计算器的状态。最后，我们使用 main() 方法创建一个 Calculator 对象并显示它。