The Object Paradigm

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The Object Paradigm

• Classes Templates for creating objects
• Includes Behaviors (methods)
• Includes Data (attributes)

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The Object Paradigm

• Objects Instances of a class
• Defined from a class template
• Consumes memory
• Identified with a object reference
• Has a finite lifespan

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The Object Paradigm

• Encapsulation How an object performs its duties
  is hidden from the outside world
• Methods can be used without the knowledge of the
  inner workings
• Inner workings can be modified without impacting
  use (as long as the interface is unchanged)

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The Object Paradigm

• Association Relationship between two classes

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The Object Paradigm

• Composition Supports a part-of relationship

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The Object Paradigm

• Aggregation Whole/part relationship where the
  lifetimes of the whole and part are not
  necessarily bound together
• Composition Whole/part relationship where the
  lifetimes of the whole and part are bound together

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The Object Paradigm

• Inheritance Defines a kind-of relationship.
  Supports reusing common attributes and methods
  from a base class to derived classes.
  Specialization

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The Object Paradigm

• Abstract Classes
• Do not include implementation code sufficient to
  instantiate an object
• Used to define the common data and behavior of
  the derived classes
• Very powerful design maintenance concept

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The Object Paradigm

• Interface 100 abstract methods
• Derived classes must define behavior
• A class can inherit from many interfaces (pseudo
  multiple inheritance).

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The Object Paradigm

• Polymorphism The ability of objects with the
  same inheritance to perform any given behavior
  differently