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I found a library called Cactoos which they've created based on some object-orientated principles:

  • No null
  • No code in constructors
  • No getters and setters
  • No mutable objects
  • No static methods, not even private ones
  • No instanceof, type casting, or reflection
  • No implementation inheritance
  • No public methods without @Override
  • No statements in test methods except assertThat

  • As an example, they sort a file like:

    They claim that their code is more object-orientated, but it doesn't seem better than alternatives like Guava to me. What do you think of the design of this? Some of the code they produce does look like they're heading towards a functional programming style so maybe they'd be better embracing that instead.
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