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Sun's NetBeans 4.1: Page 3 of 3

Also cool is the Profiler plug-in, which competes directly with Borland's OptimizeIt, only Sun's profiler is free (as in gratis). The profiler takes advantage of a Sun internal technology called JFluid, which allows instrumentation on Pcode, and will be included in Java 5 Update 4 JVM. It also provides the ability to analyze memory, code and CPU as well as allows you to filter the code you want to analyze so you don"t have to dig through tons of core Java or Swing methods to find your own.

It's been a long time since an IDE excited me as much as NetBeans 4.1. Snappy performance on a new build of Swing coupled with features such as refactor and no-code Web services as well as its ability to generate and interact with multiple types of beans and it's free? That's one heck of a deal.