Dynamic Method Dispatch.

In this article,Dynamic Method Dispatch is explained in detail with examples.
you will know about what is Dynamic method dispatch in the java program and why this method is also known as dynamic polymorphism,is clearly explained with different Examples.
This concept in Core Java is related to dynamic polymorphism (Dynamic Method Dispatch) it is implemented through overriding in multi-level inheritance.

Here using the object reference variable of a top-level base class,we invoke overriding methods in respective sub-class,when base-class object reference variable contain sub-class object reference codes.This mechanism is known as "dynamic polymorphism" because JVM (Java Virtual Machine) knows which overriding method need to be invoked from sub classes only during execution time.
(From topic Dynamic Method Dispatch)

Ex

//program related to Dynamic Method Dispatch.

class A

{

void m1()

{

System.out.println("Class A m1()");

}

}

class B extends A

{

void m1()

{

System.out.println("Class B m1()");

}

}

class C extends B

{

void m1()

{

System.out.println("Class C m1()");

}

}

class D extends C

{

void m1()

{

System.out.println("Class D m1()");

}

}

class Dispatch

{

public static void main(String args[])

{

A a; //object ref variable of top-level base class.

a=new A();

a.m1();

a=new B();

a.m1();

a=new C();

a.m1();

a=new D();

a.m1();

}

}

Output

Class A m1()

Class B m1()

Class C m1()

Class D m1()

                               To get the code file use me.

Ex

//program related to Dynamic Method Dispatch.

class A

{

void call()

{

System.out.println("Class A Call()");

}

}

class B extends A

{

void call()

{

System.out.println("class B Call()" );          //(From topic Dynamic Method Dispatch)

}

}

class C extends B

{

void call()

{

System.out.println("Class C call()");

}

}

class Dispatch1

{

public static void main(String args[])

{

A a=new A();

B b=new B();

C c=new C();

A r;

r=a;

r.call();

r=b;

r.call();

r=c;

r.call();

}

}

Output

Class A call()

Class B call()

Class C call()

                            To get the code file use me.

Note

This concept in C++ is known as run-time polymorphism and is implemented through virtual functions. (From topic Dynamic Method Dispatch)

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