【java】学习路线13-多态继承

/*多态
创建一个父类的对象，用子类去初始化
如果要使用子类的方法，则需要把对象强制转换为子类的(xx)xxx
*/

public class Learn01{
   public static void main(String[] aa){

       Person p1=new Student(18);
       p1.changeName("Remoo");
       System.out.println("p1's name:"+p1.getName());

       System.out.println(((Student)p1).getScore());//18
       ((Student)p1).changeScore(666);
       System.out.println(((Student)p1).getScore());//666
   }
}

class Person{
   private String name;

   //Construction method
   public Person(){}
   public Person (String name){
       this.name = name;
   }

   //getter&setter
   public void changeName(String name){
       this.name = name;
   }
   public String getName(){
       return this.name;
   }
}

class Student extends Person{

   private int score;

   //Construction method
   public Student(int score){
       this.score = score;
   }

   //getter&setter
   public void changeScore(int score){
       this.score = score;
   }
   public int getScore(){
       return this.score;
   }

}

巴特西

【java】学习路线13-多态继承

最新文章

热门文章