Java Stream API: Complete Guide with Practical Examples

Stream API is one of the most powerful and widely used features introduced in Java 8. It allows you to write clean, readable, and declarative code to process data from arrays, collections, and other sources.

In this section, you will learn:

• how to create streams from different sources;
• the difference between intermediate and terminal operations;
• how to safely handle values using the Optional class;
• how to convert an int[] array to List<Integer> and back;
• how to use the collect() method and the Collectors interface;
• how to work with primitives using IntStream, LongStream, DoubleStream;
• and even how to run streams in parallel.

Each topic comes with practical code examples, clear explanations, and best practices.

Stream API is more than just syntax sugar — it's a tool that helps you write functional, concise, and safe code. Once you master it, working with data in Java becomes faster, simpler, and more enjoyable.

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