Problems with WeakHashMap

2006-01-17 15:35:30 · Asides

Following Bharath Ganesh's post I copied his code piece and tried it. The result was 1. "Great", I thought, "The problem must be in his JVM, whatever that is." Just for a small test, I added another line, s2 = null, right before the call to the garbage collector. The result was still 1. First null wasn't a constant, and now this!

Comments (2)

Avah 2006-01-17 15:45:56

Upodate: All is well, there is order in the universe. I added a Thread.sleep(1000) after the call to the Systen.gc(), thinking it might be asynchronious. It was. And the result actually was 0, just as Bharath Ganesh says. Weird.

Avah 2006-01-17 15:51:35

Which reminds me. The JavaDoc specifies:

When control returns from the method call, the virtual machine has made its best effort to recycle all discarded objects.

So why is it asynchronious?