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What is Polymorphism in Java ?

  • Polymorphism in Java is a concept in different ways we can perform a single action.
  • Poly and morphs. The word “poly” means many and “morphs” means forms. Many forms are known as polymorphism.
Polymorphism in Java
  • There are two types of polymorphism in Java:
    • Compile-Time Polymorphism and
    • Runtime Polymorphism.
  • Polymorphism in java we can perform by method overloading and method overriding.

Dynamic Method Dispatch or Runtime Polymorphism in Java

  • Java supports Runtime Polymorphism is one of the ways is method overriding
  • A call to an overridden method is resolved at run time, rather than compile time it is called as dynamic method dispatch mechanism.
  • At run-time, it depends on the type of the object being referred that determines which version of an overridden method will be executed.
  • A subclass object refers by a superclass variable. This is also known as upcasting. Java uses this statistic to resolve calls to overridden methods at run time.
Upcasting

Example of Java Runtime Polymorphism

class Bike{  
  void run(){System.out.println("running");}  
}  
class Splendor extends Bike{  
  void run(){System.out.println("running safely with 60km");}  
  
  public static void main(String args[]){  
    Bike b = new Splendor();//upcasting  
    b.run();  
  }  
}

Output

running safely with 60km.
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