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JAVA (Language (Constructs (Control statements (loops (while, for, streams…

- - - - Object
        
        instance
        
        reference
        
        toString
        
        equals
    - - Interface
      - Class
        
        Overriding
        
        Overloading
        
        Visibility
        
        abstract
        
        constructor
        
        Generics
      - Is-a vs Has-a
      - Annotation
  - - - Autoboxing / Unboxing
      - primitive vs complex
      - Enums
    - - instance
      - local
      - scope
    - - if/else
      - switch
      - loops
        
        while
        
        for
        
        streams API
      - try/catch
  - - - Exception
        
        Checked
        
        Unchecked
      - Error
  - - - Map
      - List
      - Set
      - Queue