op4j is a powerful implementation of the Fluent Interface style of code. It allows you to create chained expressions which apply both predefined or user-defined functions to your objects in a fluid and readable way. This improves the way your code looks and greatly reduces the complexity of executing auxiliary low-level tasks in the highly bureaucratic, statically -and strongly- typed language that Java is.
It is a great library for complicated operations on Collections in one line.
More on: http://www.op4j.org/
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