Polymorphism in Java

Polymorphism in Java is a concept through which we can do a single function in different ways. Polymorphism comes from 2 Greek words: poly and morphs The word "poly" means many and "morphs" forms mean. So polymorphism means many forms.

Java has two types of polymorphism: compile time polymorphism and runtime polymorphism. We can demonstrate polymorphism in Java by method overload and method override.

A reference variable can refer to any object of any subtype of its declared type or its declared type. A reference variable can be declared as a class or interface type.

Polymorphism can be achieved in two of the following ways:

• Method Overloading(Compile time Polymorphism)
• Method Overriding(Run time Polymorphism)

Method Overloading

Compile time polymorphism refers to a process in which an overloaded method is resolved over time at compile time instead of the call. Method overloading is an example of timing polymorphism. Law overloading is a feature that allows a class to have two or more methods with the same name, but the logic passed by the methods is different.

Example - 

class Adder {

Static int add(int a, int b)

{

return a+b;

}

static double add( double a, double b)

{

return a+b;

}

 

public static void main(String args[])

{

System.out.println(Adder.add(11,11));

System.out.println(Adder.add(12.3,12.6));

}

}

Method Overriding

Runtime Polymorphism or Dynamic Method Dispatch is a process in which an override method is resolved at runtime instead of compiled-time calls.

Syntax - 

class A{}  
class B extends A{}  .

Example - 

public Class BowlerClass{

void bowlingMethod()

{

System.out.println(" bowler ");

}

public Class FastPacer{

void bowlingMethod()

{

System.out.println(" fast bowler ");

}

Public static void main(String[] args)

{

FastPacer obj= new FastPacer();

obj.bowlingMethod();

}

}

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