java - 如何限制子类修改抽象类中方法的范围？

Question

如何限制我的抽象类的实现类将方法的范围从 protected 修改为 public？

例如:假设我有一个抽象类

package com.rao.test;

public abstract  class AbstractTEClass {

    protected abstract void function1();

    protected abstract void function2();


    protected void doWork() //I want to call the abstract methods from this method.
    {
        function1(); //implementation classes will give implementation of these methods
        function2();

    }

}

现在，我有一个扩展上述抽象类的实现类

package com.rao.test;

public class AbstractTEClassImpl extends AbstractTEClass {

    @Override
    public void function1() {
        // TODO Auto-generated method stub
        System.out.println("FUnction1");
    }

    @Override
    public void function2() {
        // TODO Auto-generated method stub
        System.out.println("Function2");
    }


    public static void main(String[] args)
    {
        AbstractTEClassImpl objTEClass = new AbstractTEClassImpl();

        objTEClass.doWork();

    }

}

注意这里我把实现类中的2个抽象方法的作用域从protected改成了public，如何限制我的实现类修改作用域。
欢迎任何设计更改或建议或模式。

Answer 1

你不能。

重写类总是可以比被重写的方法更多地访问方法。

在此处阅读修饰符部分 http://docs.oracle.com/javase/tutorial/java/IandI/override.html

The access specifier for an overriding method can allow more, but not less, access than the overridden method. For example, a protected instance method in the superclass can be made public, but not private, in the subclass.

You will get a compile-time error if you attempt to change an instance method in the superclass to a class method in the subclass, and vice versa.