Monostate vs. Singleton

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monostate and singleton are two faces of the same medal (global state):

  • monostate forces a behaviour (only one value along all class instances)
  • singleton forces a structural constraint (only one instance)

singleton usage is not transparent

i.e.:

Singleton singleton = Singleton.getInstance();

monostate usage is transparent

i.e.:

MonoState m1 = new MonoState();
MonoState m2 = new MonoState(); // same internal state of m1 (e.g. static)

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