Re: general performance question

"Mike Schilling" <>
Thu, 31 Jan 2008 23:08:53 GMT
"Knute Johnson" <> wrote in message

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 "name" goes out of scope. The slot in the method stack frame that
corresponds to "o" is just another slot, exactly as if this had been written

 public void method() {
     Object oy = new Object();
     Object o = new Object();

     // do other stuff

That is, block scopes within a method exist at compile-time, but not at

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