![]() This allows us to easily handle such cases: int min1 = Arrays.stream(new int). However, it returns an Optional value, which may be Optional.empty() (the second case). But what if the stream is empty? If it wasn't for Optional, the method would return null or throw an exception. This article reviews some important questions that are asked most often and may be tricky to get right. a TreeSet in Java than the one liner I am currently using in tests: new. 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. Introduction Java Collections is a topic often brought up on technical interviews for Java developers. I am just asking myself if there is a more convenient way to create a SortedSet, e.g. Such methods would require us to write boilerplate code to check the return value, and we could sometimes forget to do a defensive check. Java 8 Stream API Interview Questions The Stream API is used for dealing with object collections. ![]() 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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