java中abstract关键字的使用案例

创建动物父类跟狗猫子类

abstract class  Animal1{ //抽象类
     String name;
     int age;
     String variety;
    public  Animal1(){

    }
    public Animal1(String name,int age,String variety){  //有参构造
        this.age=age;
        this.name=name;
        this.variety=variety;
    }
    abstract public void sheep(); //抽象方法
}

class Dog3 extends Animal1{  //继承抽象类
    public Dog3(){

    }
    public Dog3(String name, int age, String variety){  //有参构造
        super(name,age,variety);
    }
    public void sheep(){  //必须重写抽象方法
        System.out.println("狗侧着睡");
    }
}
class Cat3 extends Animal1{   //继承抽象类
    public Cat3(){

    }
    public Cat3(String name, int age, String variety){
        super(name,age,variety);
    }
    public void sheep(){   //必须重写抽象方法
        System.out.println("猫躺着睡");
    }
}
public class AbstractTest {
    public static void main(String[] args) {
        Animal1 d1=new Dog3("花花",3,"中华田园犬"); //抽象多态
        d1.sheep();
        Animal1 c1=new Cat3("球球",1,"中华田园猫"); //抽象多态
        c1.sheep();
    }
}