我不能让我的拷贝构造函数在我的简单代码中工作(我是java新手)

class MyClass implements Cloneable {
    private int value;

    public MyClass(int value) {
        this.value = value;
    }

    // 重写clone()方法
    @Override
    public Object clone() throws CloneNotSupportedException {
        return super.clone();
    }

    public int getValue() {
        return value;
    }

    public void setValue(int value) {
        this.value = value;
    }
}

public class Main {
    public static void main(String[] args) {
        MyClass obj1 = new MyClass(10);

        try {
            // 使用拷贝构造函数创建对象的副本
            MyClass obj2 = (MyClass) obj1.clone();

            System.out.println("obj1 value: " + obj1.getValue());
            System.out.println("obj2 value: " + obj2.getValue());

            // 修改obj2的值
            obj2.setValue(20);

            System.out.println("obj1 value after modification: " + obj1.getValue());
            System.out.println("obj2 value after modification: " + obj2.getValue());
        } catch (CloneNotSupportedException e) {
            e.printStackTrace();
        }
    }
}

obj1 value: 10
obj2 value: 10
obj1 value after modification: 10
obj2 value after modification: 20