HAS-A relationship in Java - Learn java

HAS-A relationship in Java - Learn java

1.HAS-A Relationship is also knows as composition(or) aggregation.

2.There is no specific keyword to implement HAS-A relationship but mostly 

    we can use new operator.

3.The main advantage of  reusability.

Example:-

class Engine
{
 // engine functionality
}
class Car
{
   Engine e=new Engine();
  //------------------------------;
  //------------------------------;
  //------------------------------;
}

NOTE:-

class car has-a engine reference.
The main dis-advantage of has-a relationship increases dependency between the
components and creates maintains problems.


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