Java HashMap; Is recommendable?

Question

It has been reported that from Java JDK 1.3.1 to JDK 1.4.0 HashMap is 5 times slower (see here).

What is the state of the art of HashMap at java 6? Is recommendable to be used?

Thanks.

Answer 1

That bug is marked fixed in 1.4.0_02 and 1.4.1, so there probably isn't any need to worry about its performance in Java 1.6.

(If you're in a multithreaded environment, you probably want ConcurrrentHashMap.)