Java - netbeans - notepadGUI的撤消/重做代码

import java.util.Stack;

// 定义命令接口
interface Command {
    void execute();
    void undo();
}

// 定义具体命令类
class AddCommand implements Command {
    private int num;
    private Stack<Integer> stack;

    public AddCommand(int num, Stack<Integer> stack) {
        this.num = num;
        this.stack = stack;
    }

    public void execute() {
        stack.push(num);
        System.out.println("执行加法操作，当前结果：" + stack.peek());
    }

    public void undo() {
        stack.pop();
        System.out.println("撤消加法操作，当前结果：" + stack.peek());
    }
}

class Calculator {
    private Stack<Command> undoStack;
    private Stack<Command> redoStack;

    public Calculator() {
        undoStack = new Stack<>();
        redoStack = new Stack<>();
    }

    public void executeCommand(Command command) {
        command.execute();
        undoStack.push(command);
        redoStack.clear();
    }

    public void undo() {
        if (!undoStack.isEmpty()) {
            Command command = undoStack.pop();
            command.undo();
            redoStack.push(command);
        } else {
            System.out.println("无可撤消的操作");
        }
    }

    public void redo() {
        if (!redoStack.isEmpty()) {
            Command command = redoStack.pop();
            command.execute();
            undoStack.push(command);
        } else {
            System.out.println("无可重做的操作");
        }
    }
}

public class Main {
    public static void main(String[] args) {
        Calculator calculator = new Calculator();
        Stack<Integer> stack = new Stack<>();

        // 执行加法操作
        Command addCommand1 = new AddCommand(5, stack);
        calculator.executeCommand(addCommand1);

        // 执行加法操作
        Command addCommand2 = new AddCommand(10, stack);
        calculator.executeCommand(addCommand2);

        // 撤消操作
        calculator.undo();

        // 重做操作
        calculator.redo();
    }
}