Java exploratory programming

Sometime you just need to test some external libraries – how they work. In Java I was always creating some file, compile it and test, then I want to change something, compile, test. Not comfortable at all!!

Today I had a need to check how Joda-time library working with periods, to test correctness of implementation of iso8601 in Erlang. Surprisingly, I found an article about

It is usable when you want to debug regular expression, test some new library, etc etc etc. I found this quite comfortable for myself.