Modifier

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 MODIFIER

· Modifier

· private/ default/ protected/ public

· Non modifier

· final/ static/ abstract

· transient/ volatile/ native/ synchronized



I. Class Modifier

  •  A class (A) can access to other class (B) :
  • Create a new object of class B
  •  Extend class B
  • Access to method/ property in class B

Default Access

  • Do not use public keyword when create a new class.
  • Can be accessed by other classes in same package
  • Can not be accessed by other class if not in same package

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Public Access

  •  Use public keyword when create a new class
  •  Allow all class from other packages access and create new object


Final Class

  • Can not be extended
  •  Other class can access via create new object

Abstract Class

  • Do not allow initialize an object if it's abstract class
  • Can be used via extend

II. Method/ Property Modifier