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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.
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.)