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Design patterns (Creational Patterns (Singletone (static instance (Classic…

- - - - input
        
        parameter
      - output
        
        object
      - ObjectFactory
        
        get("TYPE")
    - - factory of factories
  - - - prevent outside instantiation
    - - of himself
      - Classic singletone
        
        lazy instantiation
    - - static method
      - returns objects instance
    - - thread safe
      - get instance when needed
        
        private class
        
        declares method
        
        private static final SingletonSample INSTANCE = new SingletonSample();
  - - - a value
      - creation
        
        Abstract class
        
        Full class
        
        Emtpy class
  - - - object
        
        has A
        
        is A
- - - - runtime
    - - strategy
        
        Interface
      - strategy implementations
        
        concrete classes