What is the Stream API?

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The Stream API in Java (introduced in Java 8) is a powerful feature for processing collections and sequences of data in a functional, declarative style. It allows you to perform operations like filtering, mapping, and reducing without writing explicit loops.

A Stream is not a data structure; it’s a sequence of elements from a data source (like a List, array, or I/O channel) that supports pipeline operations.

Key Features:

1. Functional style – Use methods like filter(), map(), sorted(), and collect() to process data.

2. Lazy evaluation – Operations aren’t executed until a terminal operation (e.g., collect(), forEach(), reduce()) is called.

3. Parallel processing – Use parallelStream() to process data in multiple threads.

4. Non-mutating – Doesn’t change the original data source.

Example:

List<String> names = Arrays.asList("John", "Jane", "Jack");

names.stream()
     .filter(n -> n.startsWith("J"))

     .map(String::toUpperCase)

     .forEach(System.out::println);

The Stream API improves readability, reduces boilerplate, and makes complex data processing concise and efficient.

Read More:

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