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|Interview Questions and Answers|
|Ans. Abstract classes are only meant to be sub classed and not meant to be instantiated whereas concrete classes are meant to be instantiated.|
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|Like Discuss Correct / Improve  java   oops   abstract classes   Abstract vs Concrete Class Asked in 1 Companies basic   frequent|
|Differences between abstract class and interface ?|
|If an Abstract class has only abstract methods, What's the difference between such a class and an interface ?|
|What are the design considerations while making a choice between using interface and abstract class ?|
|How is Abstraction implemented in Java ?|
|Difference between Base Class, Derived Class , Abstract Class and Concrete Class ?|
|What is an abstract class ?|
|Shall we use abstract classes or Interfaces in Policy / Strategy Design Pattern ?|
|Will this code Work ? If not , Why ?|
|Is java.util.Date an abstract Class ? Is java.util.Calendar an abstract Class ?|