Polymorphic members access features

Package Day8; 

public  class Polymorphyic { 

    public  static  void main (String [] args) { 
Fruit F = new new Apple (); 
System.out.println (f.num); // member variable to see the left running, the output parent num, "10" 
Apple = A new new Apple (); 
a.print (); // member methods look to the right, the output subclass print (), "sub-class constructor" 
    } 

} 
class Fruit {
     int NUM = 10 ; // parent class member variables
     public  void Print () { 
        System.out.println ( "parent class constructor" ); 
    } 
} 
classApple the extends Fruit {
     int NUM = 20 is ; // child class member variables
     public  void Print () { 
        System.out.println ( "subclass constructor" ); 
    } 
}

operation result:

10

Subclass Constructors

to sum up:

Member variable: Compile the left to see the parent class, run to see the left side of the parent class

Member methods: Compile the left to see the parent class, run to see the right sub-categories