Explain Java Streams API.

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1. What is Java Streams API?

The Streams API in Java, introduced in Java 8, is a powerful way to process collections of data in a functional style.
It allows you to perform operations like filtering, mapping, and reducing on sequences of elements (like lists, sets, or arrays) without writing explicit loops.

A stream is not a data structure, it does not store data. Instead, it transforms or processes data from a source (like a collection) in a pipeline of operations.

2. Key Features

  1. Functional-style operations: You can perform operations like filter, map, reduce, forEach, etc.

  2. Lazy evaluation: Streams are evaluated only when needed. Intermediate operations are not executed until a terminal operation is invoked.

  3. Parallel processing: Streams can be processed in parallel easily using parallelStream() for better performance on multicore processors.

  4. Declarative programming: Focuses on what to do, not how to do it.

3. Types of Operations

  1. Intermediate operations – Return a new stream, allowing chaining.

    • Examples: filter, map, sorted, distinct, limit.

  2. Terminal operations – Produce a result or side-effect and end the stream pipeline.

    • Examples: forEach, collect, reduce, count, anyMatch.

4. How it Works

A stream works as a pipeline with three stages:

  1. Source – Where the data comes from (collections, arrays, I/O channels).

  2. Intermediate operations – Transform or filter the data lazily.

  3. Terminal operation – Produces the final result (like a list, sum, or printed output).

5. Advantages of Streams

  • Concise and readable code compared to traditional loops.

  • Easy parallelization with minimal effort.

  • Less error-prone because no explicit iteration or index management.

  • Encourages functional programming style in Java.

✅ Key Tip:
Think of a stream as a conveyor belt in a factory: raw materials (data) enter at one end, pass through several processing stations (intermediate operations), and finally produce the finished product (terminal operation).

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