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Once you have it, you can run it by double-clicking (assuming you have Java installed).  Here is a screenshot, showing some of the source code for Clooj itself:

The left column is the file-browser window, where you choose different files and projects to work on.  The middle window is where code in files is edited.  The right column is called the "Read-Eval-Print Loop" (or REPL for short)----this is where you test code out as you're writing it.