What are some examples of using the collect method in Java 8 Stream API?

Can you give me some examples of using the collect method in Java 8 Stream API?

Sure! The collect method in Java 8 Stream API is used to transform the elements of a stream into a different form, usually a collection. For example, you can use it to convert a stream of strings into a List.

What are some specific examples of collectors?

Some common collectors include Collectors.toList(), Collectors.toSet(), and Collectors.toMap(). For instance, you can use Collectors.toList() to gather elements into a List.

Can you show me a code snippet for Collectors.toMap()?

Certainly! Here's a simple example:

Map<Integer, String> map = stream.collect(Collectors.toMap(String::length, Function.identity()));

This collects strings into a map where the key is the string length.

What about using groupingBy with collect?

Great question! You can use Collectors.groupingBy() to group elements by a classifier function. For example:

Map<Integer, List<String>> groupedByLength = stream.collect(Collectors.groupingBy(String::length));

This groups strings by their lengths.