The sun's java workshop (not studio, it is for beginners) is a free tool (IDE) to develop java applets and applications. You can download from the java.sun.com, about 9MB. It has a usable debugger and profiler too. It was written in java, thus you need a strong hardware (Min. P166, 64MB RAM).<br>
You also use the debugger in the JDK, but it is very stupid.<br>
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Good luck,<br>
Otto.