Beginner’s Guide to Java 8 Stream API

Mastering the Stream API for more readable, maintainable, and efficient Java code.

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The Java Stream API, a dynamic feature introduced in Java 8, empowers us to perform functional-style operations on sequences of elements, typically collections. It equips us with a comprehensive set of methods for transforming, filtering, and collecting data in a readable and concise way.

The Stream API works by creating a pipeline of operations on data. The pipeline consists of three main stages:

Creating Streams

Streams can be created from various data sources such as collections, arrays, or I/O channels.

• From Collections:

List<String> list = List.of("one", "two", "three");
Stream<String> stream = list.stream();

• From Arrays:

String[] array = {"one", "two", "three"};
Stream<String> stream = Arrays.stream(array);

• Using Stream Builder:

Stream<String> stream = Stream.<String>builder()
                             .add("one")
                             .add("two")
                             .add("three")…