• On surface, inheritance is a code re-use issue.  We can extend code that is already written in a manageable manner.
   
• Create new class from existing class
  -- Absorb existing class's data and behavior
  -- Enhance with new capabilities
   
• Subclass extends Superclass
  -- Object of one class "is an" object of another class
  -- Rectangle is quadrilateral
  -- Class Rectangle inherits from class Quadrilateral
  -- Quadrilateral: superclass
  -- Rectangle: subclass
   
• Superclass typically represents larger set of objects than subclasses
   
• Inheritance example

  

   

• Inheritane hierarchy
  -- Inheritance relationships: tree-like hierarchy structure
  -- Each class becomes superclass or subclass
   
• Example of Inheritance Hierarchy
  
                           

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