code5_downcasting_with_instanceof.java

// When Subclass type refers to the object of Parent class, it is known as downcasting. 

// If we perform it directly, compiler gives Compilation error. 
// Eg - Dog d=new Animal();  //Compilation error 

// If you perform it by typecasting, ClassCastException is thrown at runtime.
// Dog d=(Dog)new Animal();  //Compiles but ClassCastException is thrown at runtime 

class Animal { }  
  
class Dog3 extends Animal {  
  static void method(Animal a) {  
    if(a instanceof Dog3){  
       Dog3 d=(Dog3)a;    //downcasting  
       System.out.println("ok downcasting performed");  
    }  
  }  
   
  public static void main (String [] args) {  
    Animal a=new Dog3();  
    Dog3.method(a);  
  }  
    
 }