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Dr.Java - an interesting lightweight IDE

http://www.drjava.org/

Dr.Java is an interesting little IDE that helps newcomers develop Java code. Although aimed at newcomers, it seems to have lots of advanced features. It could be a useful alternative to the larger IDEs like Eclipse and NetBeans.
I found it useful to create small projects and play around with compiling and easily interacting with Java code, without the hassle of creating a large project in a full featured IDE.
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