Hi Lukas,
Whilst generic collections provide type safety at compile time, at runtime all of the specific type information is erased and the collections classes behave much the same way as their Java 1.4 predecessors. With respect to the actual implementations of the classes within the Java Collections Framework, having spent a fair amount of time looking at them, I see nothing to suggest that their reimplementation in Java 5 would give rise to any performance improvement. The only noticeable change to the collections classes is their generification. Any specific performance improvements that you may observe are likely to be due to more general performance improvements that have been made to Sun's Java 5 JRE (note that it's possible that some of these improvements may also have been included in the recent latest releases of the 1.4 JDK).
Chris
Lukas Vlcek wrote:
Hi, Is there any performance gain in <Generics> Collections in Java5? Can I expect performace improvement or specialized type collection libraries (like fastutil) will be always faster. Lukas
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