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cycle is based on desire

OOAD

static method (class method) と instance method の使い分け

Java に関わった話ではないと思い One rule-of-thumb: ask yourself "does it make sense to call this method, even if no Obj has been constructed yet?" If so, it should definitely be static. Java: when to use static methodsstackoverflow.com

delegate

Draft article what is GoF Delegation The Gang of Four is wrong and you don't understand delegation - Saturn Flyer with Jim Gaywww.saturnflyer.com non-free article Using prototypical objects to implement shared behavior in object-oriented s…

Composition or Inheritance

Prefer composition over inheritance?stackoverflow.com