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java type system - Coggle Diagram

- - - - boolean types
      - numeric types
        
        byte
        
        short
        
        int
        
        long
        
        char
        
        float
        
        double
    - - primitive values
  - - - class type
      - interface type
      - array type
      - type variables
    - - reference value
        
        points to object
        
        an object is dynamically created instance of a class or dynamically created array
        
        all object support methods of class object
        
        String literal are represented by String object
        
        object can be created explicitly or implicitly
        
        null reference
    - - super type of all classes
    - - represents the class of the object
    - - represents sequence of unicode cod epoints
      - string literals are reference to instance of String class
    - - at runtime
      - at compile time
  - - - the from type possibly include type variable and parameterized types
      - the to types are never type variable or parameterized types