JavaSE-11.1.4【多态案例-猫和狗】

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package day2.yubaby01.p4;   /* 1.5 多态案例-猫和狗  */   public class AnimalDemo {       public static void main(String[] args) {         Animal a = new Cat();         a.setName("tom");         a.setAge(3);         System.out.println(a.getName() + "," + a.getAge());         a.eat();           a = new Cat("tom", 3);         System.out.println(a.getName() + "," + a.getAge());         a.eat();           Animal aa = new Dog();         aa.setName("sam");         aa.setAge(1);         System.out.println(aa.getName() + "," + aa.getAge());         aa.eat();           aa = new Dog("sam", 1);         System.out.println(aa.getName() + "," + aa.getAge());         aa.eat();     }   }

　　

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package day2.yubaby01.p4;   public class Animal {       private String name;     private int age;       public Animal() {     }       public Animal(String name, int age) {         this.name = name;         this.age = age;     }       public void setName(String name) {         this.name = name;     }       public void setAge(int age) {         this.age = age;     }       public String getName() {         return name;     }       public int getAge() {         return age;     }       public void eat(){         System.out.println("动物进食");     }   }

　　

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package day2.yubaby01.p4;   public class Cat extends Animal{       public Cat() {     }       public Cat(String name, int age) {         super(name, age);     }       @Override     public void eat(){         System.out.println("猫吃啥？");     }   }

　　

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package day2.yubaby01.p4;   public class Dog extends Animal{       public Dog() {     }       public Dog(String name, int age) {         super(name, age);     }       @Override     public void eat(){         System.out.println("狗吃啥？");     }   }