JavaSE-11.2.3【抽象类案例-猫和狗】

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package day2.yubaby02.p3;   /* 2.4 抽象类案例-猫和狗  */   public class AnimalDemo {       public static void main(String[] args) {         Animal a1 = new Cat();         a1.setName("tom");         a1.setAge(1);         System.out.println(a1.getName() + "," + a1.getAge());         a1.eat();           Animal a2 = new Cat("tom", 1);         System.out.println(a2.getName() + "," + a2.getAge());         a2.eat();           Animal a3 = new Dog();         a3.setName("sam");         a3.setAge(2);         System.out.println(a3.getName() + "," + a3.getAge());         a3.eat();           Animal a4 = new Dog("sam", 2);         System.out.println(a4.getName() + "," + a4.getAge());         a4.eat();     }   }

　　

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package day2.yubaby02.p3;   public abstract 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");     }*/       public abstract void eat(); }

　　

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package day2.yubaby02.p3;   public class Cat extends Animal{       public Cat() {     }       public Cat(String name, int age) {         super(name, age);     }       //技巧-子类重载父抽象类中的抽象方法，键入eat,idea候选选中自动生成函数     @Override     public void eat() {         System.out.println("猫吃啥？");     } }

　　

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package day2.yubaby02.p3;   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？");     } }