基于swing生成计算器带注释

好的，我可以为您提供一个基于Swing生成计算器的代码示例，其中包含注释，方便您阅读和理解。

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class Calculator extends JFrame implements ActionListener {

    private static final long serialVersionUID = 1L;

    // 创建需要用到的组件
    JTextField resultField = new JTextField();
    JPanel buttonPanel = new JPanel();

    // 定义计算器上的按钮
    String[] buttonLabels = { "7", "8", "9", "/", "4", "5", "6", "*", "1", "2", "3", "-", "0", "C", "=", "+" };
    JButton[] buttons = new JButton[buttonLabels.length];

    // 记录计算器的状态和操作，以便进行计算
    int firstNumber = 0;
    int secondNumber = 0;
    String operation = "";
    boolean newNumber = true;

    public Calculator() {
        // 设置计算器的标题和大小
        setTitle("Calculator");
        setSize(300, 300);

        // 设置结果文本框不可编辑
        resultField.setEditable(false);

        // 将计算器的组件添加到面板中
        Container contentPane = getContentPane();
        contentPane.add(resultField, BorderLayout.NORTH);
        contentPane.add(buttonPanel, BorderLayout.CENTER);

        // 设置面板的布局为网格布局
        buttonPanel.setLayout(new GridLayout(4, 4));

        // 创建按钮并添加到面板中，并为按钮添加事件监听器
        for (int i = 0; i < buttonLabels.length; i++) {
            buttons[i] = new JButton(buttonLabels[i]);
            buttons[i].addActionListener(this);
            buttonPanel.add(buttons[i]);
        }
    }

    // 处理按钮事件
    public void actionPerformed(ActionEvent e) {
        String buttonLabel = e.getActionCommand();

        // 如果按下的是数字键
        if (buttonLabel.matches("\\d")) {
            if (newNumber) {
                resultField.setText(buttonLabel);
                newNumber = false;
            } else {
                resultField.setText(resultField.getText() + buttonLabel);
            }
        }

        // 如果按下的是操作符键
        if (buttonLabel.matches("\\+|\\-|\\*|\\/")) {
            firstNumber = Integer.parseInt(resultField.getText());
            operation = buttonLabel;
            newNumber = true;
        }

        // 如果按下的是等号键
        if (buttonLabel.equals("=")) {
            secondNumber = Integer.parseInt(resultField.getText());
            int result = 0;

            if (operation.equals("+")) {
                result = firstNumber + secondNumber;
            }
            if (operation.equals("-")) {
                result = firstNumber - secondNumber;
            }
            if (operation.equals("*")) {
                result = firstNumber * secondNumber;
            }
            if (operation.equals("/")) {
                result = firstNumber / secondNumber;
            }

            resultField.setText(Integer.toString(result));
            newNumber = true;
        }

        // 如果按下的是清除键
        if (buttonLabel.equals("C")) {
            resultField.setText("");
            newNumber = true;
            firstNumber = 0;
            secondNumber = 0;
            operation = "";
        }
    }

    public static void main(String[] args) {
        Calculator calculator = new Calculator();
        calculator.setVisible(true);
    }
}

希望这份代码能对您有所帮助！