README.md

State

https://refactoring.guru/ja/design-patterns/state

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classDiagram
  class Context {
    state
    requestX()
    requestY()
    requestZ()
  }
  class State {
    methodA()
    methodB()
    methodC()
  }
  class ConcreteStateA {
    methodA()
    methodB()
    methodC()
  }
  class ConcreteStateB {
    methodA()
    methodB()
    methodC()
  }
  Context o--> State
  ConcreteStateA --|> State
  ConcreteStateB --|> State