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|Java - Interview Questions and Answers|
|Ans. Keep it as a Abstract Class if its a "Is a" Relationsship and should do subset/all of the functionality. Keep it as Interface if its a "Should Do" relationship.|
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|Differences between abstract class and interface ?|
|What are the different uses of Interfaces in Java ?|
|Why can't we have diamond problem with interfaces ?|
| What is the difference between List, Set and Map ?|
What are the different Java Collections Interfaces ?
|What are Marker Interfaces ? Name few Java marker interfaces ?|
|Why do we need Thread class even in case we execute thread using runnable interface ?|
|Which of the following doesn't extend Collection interface ?|
|If an Abstract class has only abstract methods, What's the difference between such a class and an interface ?|
|What is an API ( Application Programming Interface ) ?|
|Can we declare interface methods as private ?|