通过内部类的方式-JAVA变相实现多继承

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package com.algorithm;   public class Animal {       class Cat {        public void say(){            System.out.println("小猫喵喵叫");        }        public void run(){            System.out.println("小猫跑跑跑");        }        public void jump(){            System.out.println("小猫跳跳跳");        }           }     class Dog {         public void say(){             System.out.println("小狗旺旺叫");         }         public void run(){             System.out.println("小狗跑跑跑");         }         public void jump(){             System.out.println("小狗跳跳跳");         }       }   }

　　

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package com.algorithm;   public class Mammal extends Animal  {     public static void main(String[] args) {         Mammal mammal = new Mammal();         Dog dog = mammal.new Dog();         dog.say();         dog.run();         dog.jump();         Cat cat = mammal.new Cat();         cat.say();         cat.run();         cat.jump();     } }

　　

运行结果:

小狗旺旺叫
小狗跑跑跑
小狗跳跳跳
小猫喵喵叫
小猫跑跑跑
小猫跳跳跳