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|Java - Interview Questions and Answers|
|Not frequently asked as it was introduced with Java 8.|
|Ans. Optional is a good way to protect application from runtime nullPointerException in case the the absent value has been represented as null. So basically Optional class provides the type checking during compile time and hence will never result in NPE.|
For ex -
So Now , even when the first list element is empty, this code will never throw an NullPointerException.
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|Difference between final and effectively final ? Why is effectively final even required ?|
|What is StringJoiner ?|
|Why can't we have diamond problem with interfaces ?|
|Is it ok to use optional everywhere just to get over nullpointerexception ?|
|What are new features introduced with Java 8 ?|
|What is the @FunctionalInterface annotation ?|
|Difference between DoubleSummaryStatistics , IntSummaryStatistics and LongSummaryStatistics ?|
|Name few "Optional" classes introduced with Java 8 ?|
|What are the changes in Java.io in Java 8 ?|