What is the collect operation in Java Streams API?

Can you explain what the collect operation is in the Java Streams API?

Sure! The collect operation in Java Streams API is a terminal operation that transforms the elements of a stream into a different form, usually a collection like a List, Set, or Map.

How do I use the collect operation to convert a stream to a List?

You can use the Collectors.toList() method. For example: List<String> list = stream.collect(Collectors.toList());.

Are there other collectors I can use with the collect operation?

Yes, there are several collectors like Collectors.toSet(), Collectors.toMap(), and Collectors.joining() for different use cases.

Can you give me an example of using Collectors.groupingBy?

Certainly! You can group elements by a classifier function using Collectors.groupingBy(). For example: Map<Integer, List<String>> grouped = stream.collect(Collectors.groupingBy(String::length));.