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|Java - Interview Questions and Answers|
|Ans. 1. Regulation / Enforcement / Policy / Contract , It's primary use|
2. Use as a collection of utility methods(since java 8 through default methods)
3. Collecting constants together, As Interface are lighter, it makes sense to use them instead of classes if no getters and setters required.
4. Creation of Custom Annotations
5. Special services like marker interface
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|Differences between abstract class and interface ?|
|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 ?|