Polymorphism in Java

  • Polymorphism is used to assume the ability of several
    different forms. Or we can say performing one task in different ways.
  • In java + operator is used for addition as well to concatenate
    (join) strings. Here a single operator is doing two different things depending
    upon the type of argument, so it is the situation of polymorphism.

Types of Polymorphism

Compile Time Polymorphism

  • When functionality of an object bound at compile time, it is
    known as compile time polymorphism.
  • Compile time polymorphism is of two types, operator overloading
    and method overloading.
  • Java doesn’t support operator overloading, it only support method overloading.

Note: It is given in java language specification that java doesn’t
support compile time polymorphism, method overloading is also supported at method overriding.

Runtime Polymorphism

  • When functionality of an object bound at runtime, it is
    known as runtime polymorphism.
  • Method overriding
    is the example of runtime polymorphism.

Method Overloading

Whenever we keep more than one method of same name but
different in prototype in a class, it is known as method overloading.
Method overloading is achieved when:
1. Number of arguments are different
void show(int a);
void show(int a, int b);
2. Number of arguments same but different in data type
void show(int a);
void show(float a);
void show(long a);
A program to show method overloading is given below.
class demo
{
  void show(int a)
  {
   
System.out.println(“int”);
  }
 
  void show(float a)
  {
   
System.out.println(“float”);
  }
 
  void show(long a)
  {
   
System.out.println(“long”);
  }
 
  public static void main(String…s)
  {
    demo d = new
demo();
    d.show(10);
    d.show(10.0F);
    d.show(10L);
  }
}

Function Overloading

Method Overriding

Whenever parent and child class have same method, it is
known as method overriding.
class base
{
                void
show()
                {
                                System.out.println(“base”);
                }
}
class child extends base
{
                void
show()
                {
                                System.out.println(“child”);
                }
                public
static void main(String…s)
                {
                                child
c=new child();
                                c.show();
                }
}

Function Overriding

If you have any doubt in above tutorial then you can ask
your question.

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