Re: general performance question

Knute Johnson <>
Thu, 31 Jan 2008 14:31:39 -0800
Mike Schilling wrote:

I don't think that is true. If you create an Object in a loop and
then reassign another Object to the same reference in the loop, the
first Object is eligible for garbage collection (and will be).

The previous poster didn't mention loops, merely a nested block
For a loop, the value set in the last iteration also leaks the


How can it if the reference is created in the block?

The method's stack frame isn't collected until the method exits; it has no
notion of block scope.

public void method() {
     Object oy = new Object();
     do {
         Object o = new Object();
     } while (false) ;

     // do other stuff

So I think we are talking about two different things here. o's objects
are created on the stack but go out of scope at the end of the do loop.
  The OP said that there would still be a reference to o's last object
after the loop finished. How can that be if it is inside the block of
the loop. All of the other Objects could have long since been GC'd.

oy's object will still have a reference until the end of method() or
until assigned to another object. As soon as that occurs oy's first
Object can be GC'd even before the end of method(), yes?


Knute Johnson
email s/nospam/knute/

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