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Dynamic method dispatch

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Dynamic dispatch is a process of selecting, which methods to call at run-time. It is a mechanism by which a call to overridden method at run time is resolved rather then compile time.

Dynamic method dispatch

Dynamic dispatch is a process of selecting, which methods to call at run-time. It is a mechanism by which a call to overridden method at run time is resolved rather then compile time. Method of execution is based upon the type of  object  being referred. By this  run-time polymorphism is achieved  in java. Let suppose a class A contain a method display() ,class B extends A and override method display, we generally create a object of parent class or child class or reference variable of parent class. Now we are creating a reference of parent class through which we call parent class method and child class method as well.

Example :  How to implement dynamic dispatch in java

class A
{
 public void display()
 {
	 System.out.println("In class A");
 }
   }
class B extends A
  {
	public void display()
	{
		System.out.println("In class B");
	}
     }
  public class Dynamicdispatch
  {
	  public static void main(String args[])
	  {
		  A ob=new A();
		  B ob2=new B();
		  A r; //obtain a reference of type A
		  r=ob;  //r refer to A object
		  r.display(); //call display() method of A
		  
		  r=ob2;    //r refer to b object
		  r.display(); //call display()  method of B
		  
		  System.out.println("In main Class");
	  }
  }

Description : In the above example we are creating a reference of class A and through the reference of parent class that is A we used to refer the child class methods. and also parent class methods.

Output : After compiling and executing the above program

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Posted on: May 22, 2013

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