28.Java基础_抽象类

抽象类的成员特点

 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 String getName() {
         return name;
     }
     public void setName(String name) {
         this.name = name;
     }
     public int getAge() {
         return age;
     }
     public void setAge(int age) {
         this.age = age;
     }
     public abstract void eat();
 }

 public class Cat extends Animal{
     public Cat() {
     }
     public Cat(String name, int age) {
         super(name, age);
     }
     @Override
     public void eat(){
         System.out.println("猫吃鱼!");
     }
 }

 public class Dog extends Animal{
     public Dog() {
     }
     public Dog(String name, int age) {
         super(name, age);
     }
     @Override
     public void eat(){
         System.out.println("狗吃骨头!");
     }
 }

 public class test {
     public static void main(String[] args) {
         //创建对象
         //无参
         Animal a1=new Cat();
         a1.setName("加菲");
         a1.setAge(5);
         Animal b1=new Dog();
         b1.setName("小黑");
         b1.setAge(6);
         //有参
         Animal a2=new Cat("加菲",5);
         Animal b2=new Dog("小黑",6);

         //输出
         a1.eat();
         a2.eat();
         b1.eat();
         b2.eat();
     }
 }