What are Java 8 Collectors and how do I use them?

What are Java 8 Collectors and how do I use them?

Java 8 Collectors are utility classes that implement the Collector interface, allowing you to collect elements from a stream into a collection, like a List or a Map.

Can you give me an example of using Collectors to group data?

Sure! You can use Collectors.groupingBy() to group elements by a specific criterion. For example, grouping a list of people by their age.

What about using Collectors to join strings?

You can use Collectors.joining() to concatenate strings from a stream. For instance, joining a list of names into a single string.

Are there any performance considerations when using Collectors?

Yes, using Collectors can be efficient, but be mindful of the data size and the operations you perform, as they can impact performance.