protected 不是继承可用么？该怎么处理

protected 不是继承可用么？

Java code

package p1;public interface SayMe {    void say();}

Java code

package p2;import p1.SayMe;public class Person {    protected class PersonSayMe implements SayMe{        public void say(){            System.out.println("PersonSayMe");        }    }    protected void walk(){        System.out.println("Person walk");    }}

Java code

package p3;import p2.Person;import p1.SayMe;public class FeMale extends Person{    public SayMe getSayMe(){        return new PersonSayMe(); //为什么这个不能继承Person 的 PersonSayMe ？？？？    }        public static void main(String[] args){        new FeMale().walk();    }}

Java code

public class FeMale extends Person{    public SayMe getSayMe(){        return new FeMale().new PersonSayMe(); //为什么这个不能继承Person 的 PersonSayMe ？？？？    }        public static void main(String[] args){        new FeMale().walk();    }}