Re: Real Java Interview Questions
Daniel Pitts wrote:
Bent C Dalager wrote:
In article <mE4%i.13359$CN4.12479@news-server.bigpond.net.au>,
Esmond Pitt <esmond.pitt@nospam.bigpond.com> wrote:
Jobs wrote:
How can we force the garbage collector to run?
You can't.
while (true)
{
new Object();
}
Cheers,
Bent D
That might not force a GC run. It could lead to a OOME or the optimizer
might remove the creation altogether.
The optimizer problem can be dealt with by doing something with the
Object, such as add up the hash codes, and print a line whenever the sum
is zero.
The documentation for OutOfMemoryError says "Thrown when the Java
Virtual Machine cannot allocate an object because it is out of memory,
and no more memory could be made available by the garbage collector."
Arguably, a component in the JVM which predicts whether there is
collectible garbage should be considered part of the garbage collector,
so GC has run before the OOME.
Patricia
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