This allows us to easily handle such cases: int min1 = Arrays.stream(new int). Let’s start learning Java collections interview questions and prepare for Java interviews.
However, it returns an Optional value, which may be Optional.empty() (the second case). 37 Java Collections Interview Questions And Answers Collections in Java Interview Questions For Experienced from Codingcompiler.Test your Java Collections knowledge by answering these tricky interview questions on Java collections. But what if the stream is empty? If it wasn't for Optional, the method would return null or throw an exception. In Java 8, an Optional return type explicitly requires us to handle null or non-null wrapped values differently.įor instance, the Stream.min() method calculates the minimum value in a stream of values.
40 JAVA COLLECTIONS INTERVIEW QUESTIONS AND ANSWERS CODE
Such methods would require us to write boilerplate code to check the return value, and we could sometimes forget to do a defensive check. ArrayList and LinkedList both implements List interface and maintains insertion order. The main purpose of Optional, as designed by its creators, is to be a return type of methods that previously would return null.
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