Polymorphism in java???

[A Kumar]

Hi all,


Does java support both runtime as well as compile time polymorphism

..as in C++?


Tx

[Ilja Preuss]

Yes.

[A Kumar]

Hi,

can u tell me the specific ways they come into picture....

like overriding..runtime polymorphism..

then static/compile..time polymorphism.. where??

Tx
[ August 23, 2005: Message edited by: A Kumar ]

[Ilja Preuss]

Originally posted by A Kumar:
like overriding..runtime polymorphism..

Correct!

then static/compile..time polymorphism.. where??

Overloading.

[A Kumar]

Thanks Ilja....

[Ilja Preuss]

You're welcome!

[Kudret Serin]

[A Kumar]

Hi Ilja,

Can you have a look at the below URL .here he says that


overloading is assosciated with late binding...

http://www.janeg.ca/scjp/overload/poly.html

Can you clear the matter??

Tx

[Kj Reddy]

Originally posted by A Kumar:
Hi Ilja,

Can you have a look at the below URL .here he says that


overloading is assosciated with late binding...

http://www.janeg.ca/scjp/overload/poly.html

Can you clear the matter??

Tx

Late binding is some thing which will be decided during run time. In overloading the method name will be same but we can pass different parameters. Based on the parameters we passed the processor will decide which method is matching. This is called late binding.

Were as in Early binding the methods are decided during compile time itself which is faster as compare to late binding.

[A Kumar]

Late binding is some thing which will be decided during run time. In overloading the method name will be same but we can pass different parameters. Based on the parameters we passed the processor will decide which method is matching. This is called late binding.

quote:

then static/compile..time polymorphism.. where??



Overloading.

If u consider what is given in the URL page and what was Iljas post...

does overloading qualifies for both compile time as well as late binding

(run time) polymorphism..

Regards

[Ilja Preuss]

That page is *wrong* - Java doesn't use late binding for overloading, but only for overriding!

Take the following example code:

public class Foo {
  
  void print(Integer i) {
    System.out.println("integer: " + i);
  }
  
  void print(Number i) {
    System.out.println("number: " + i);
  }
  
  public static void main(String[] args) {
    Number n = new Integer(42);
    new Foo().print(n);
  }
}

If Java used late binding for overloading, the above should print "integer: 42", but it does print "number: 42" - the method to call is decided at compile time based on the type of the variable, not at runtime based on the type of the object.

Hope this helps...

[Ashok George]

waw.
Iija..
thanx for that clarification even i was following this thread acrefully!!
got new concept from that thanx!!!
thanx once again!!

[A Kumar]

Thanks Ilja...!!!

[Ilja Preuss]

I'm glad it helped!