What is the purpose of the Collectors class

The Collectors class in Java is a utility class that provides various static methods for collecting elements from streams. It allows developers to convert streams into collections, such as lists, sets, or maps, in an efficient and readable manner. This class is part of the Java Stream API, which was introduced in Java 8, and it facilitates functional programming practices within Java.

Using the Collectors class, you can perform various operations such as grouping, partitioning, and summarizing data with ease.

Here's a simple example of how to use the Collectors class to collect elements of a stream into a list:

// Example in Java import java.util.Arrays; import java.util.List; import java.util.stream.Collectors; public class CollectorsExample { public static void main(String[] args) { List names = Arrays.asList("Alice", "Bob", "Charlie"); List collectedNames = names.stream() .filter(name -> name.startsWith("A")) .collect(Collectors.toList()); System.out.println(collectedNames); // Output: [Alice] } }

Collectors Stream API Java collections functional programming data processing

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