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|Java - Interview Questions and Answers|
|Ans. Abstract classes provide a mechanism of interfacing ( using abstract method ) as well as code reuse through inheritance ( extending abstract class )|
Comparing to concrete class they have an advantage of providing interface which a concrete class doesn't provide.
Comparing to interfaces they have an advantage of providing code reuse through inheritance which interfaces dont provide.
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|Differences between abstract class and interface ?|
|Difference between Abstract and Concrete Class ?|
|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 ?|