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|Frequently asked to fresh graduates and less experienced developers. Among the first few questions in many interviews.|
|Ans. Composition - has-a relationship between classes.|
Inheritance - is-a relationship between classes.
Composition - Composing object holds a reference to composing classes and hence relationship is loosely bound.
Inheritance - Derived object carries the base class definition in itself and hence its tightly bound.
Composition - Used in Dependency Injection
Inheritance - Used in Runtime Polymorphism
Composition - Single class objects can be composed within multiple classes.
Inheritance - Single class can only inherit 1 Class.
Composition - Its the relationship between objects.
Inheritance - Its the relationship between classes.
Sample Code for inheritance
Sample Code for composition
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Try 5 Question(s) Test
|Difference between Compositions and Inheritance ?|
| Which of the following Java feature promotes access protection or Hiding ?|
|Which of the following is tightly bound ? Inheritance or Composition ?|
|Can we compose the Parent Class object like this ?|
|Which of the following Java features facilitates Dependency Injection - Inheritance or Composition ?|
|How are the concept of Association related to Composition and Inheritance ?|
|Is dependency injection possible if we don't have inheritance / Composition ?|