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|Interview Questions and Answers|
|Rarely asked as it was introduced with Java 8.|
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|Like Discuss Correct / Improve  java   optional   java 8   java8|
|Difference between final and effectively final ? Why is effectively final even required ?|
|What is StringJoiner ?|
|Why can't we have diamond problem with interfaces ?|
|What is the use of Optional ?|
|What was the driving force to introduce default methods in Interfaces wef from Java 8 ?|
|Is it ok to use optional everywhere just to get over nullpointerexception ?|
|What is concurrent interface ?|
|What are new features introduced with Java 8 ?|
|What is the @FunctionalInterface annotation ?|