why two gc() method ?

HI
to all here, i have a doubt why sun has placed 2 gc() method , one in Runtime class and another one in System class , is there any difference between them and which one should have more preference over other and why?

From the API:
The call System.gc() is effectively equivalent to the call:
Runtime.getRuntime().gc()

So, no preference. The fact that System's gc() is static makes it easier to call

Calling gc() method in both classes have same effect.

Only difference is gc method in System class is static and not static in Runtime class

If you look at the documentation of System.gc(), it says:

The call System.gc() is effectively equivalent to the call:

Runtime.getRuntime().gc()

And if you look at the documentation of Runtime.gc(), it says:

The method System.gc() is the conventional and convenient means of invoking this method.

Originally posted by vidya sagar:
Calling gc() method in both classes have same effect.

... which can be no effect at all (read the API). Calling gc() is very rarely necessary. Java usually works out when to do GC, with no assistance from the application programmer.

Hi peter

Calling gc() method in both classes have same effect.

Here i am not talking about things actually done by gc() method and its effectivess on GC functioning.

i am saying this The call System.gc() is effectively equivalent to the call: Runtime.getRuntime().gc() in my words.

If my words doesn't make correct sense,sorry for what i did.

Indeed, but note that Peter's contribution is by far the most important in this thread: don't call either version of the method.

System.gc() is static method and invoking the gc by using Runtime.getRuntime().gc();
So, No preference.

Thanks u all guys.