[Java] 接口-02

package com.bjsxt.chap03;public interface Valuable {    public double getMoney();}interface Protectable {    public void beProtected();}interface A extends Protectable {    void m();    // void getMoney();}abstract class Animals {    private String name;        abstract void enjoy();}class GoldenMonkey extends Animals implements Valuable, Protectable {    public double getMoney() {        return 10000;    }        public void beProtected() {        System.out.println("live in the room");    }        public void enjoy() {            }        public void test() {        Valuable v = new GoldenMonkey();        v.getMoney();        Protectable p = (Protectable)v;        p.beProtected();    }}class Hen implements A  {    public void m() {}    public void beProtected() {}    public double getMoney() {        return 1.0;    }    // public void getMoney() {} // 不常见，怪异的问题}