Abstraction

Abstraction

• Hide complexity, show essentials
• abstract class vs interface

  	abstract class	interface
  Inheritance	Supports single inheritance	Supports multiple inheritances
  Subclass	Use extends to inherit	Use implements to inherit
  Instantiation	Cannot be instantiated	Cannot be instantiated
  Constructor	Can have constructors	Cannot have constructors
  Method Accessibility	Methods can be public, protected, default, or private	Methods are public by default
  Method Implementation	Methods can be abstract or concrete	Methods are abstract by default
  Fields	Field can be final, non-final, static, non-static, public, protected, default, or private	All fields are public, static, and final by default

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