This repository contains concise, commented, and well-structured Java examples that demonstrate how to use the Java Stream API for efficient and modern data processing. Each example focuses on a common data transformation or query operation — from filtering and mapping, to advanced grouping and aggregation.

- **50+ Realistic Examples**

Find, filter, map, reduce, group, sort, combine, and transform data using Stream API with intuitive, idiomatic Java code.

- **Educational & Practical**

Each example is presented as a separate, easily understandable static method with clear naming and documentation, making it great for learning, interviews, or reference.

- **Covers Core Stream API Use Cases**

Including:

- Filtering and searching

- Mapping and transforming

- Distinctness and deduplication

- Sorting and ordering

- Reducing, aggregating, and summarizing

- Working with objects

- Advanced grouping and partitioning

- Optional usage and null safety

- Collectors and downstream collectors

- Counting, summing, averaging, finding min/max

- Combining and joining strings or lists

- Extracting, flattening, and mapping nested structures

- Grouping and partitioning data

- Generating and processing random data

- Working with custom objects and collections

1. **Clone the repo:**

`git clone https://github.com/yourusername/java-stream-api.git`

2. **Open in your favorite IDE**

3. **Run the main class (`App.java`)** to execute all examples, or call any method independently.

- **Java learners** wishing to deepen practical knowledge

- **Java developers** needing quick reference or copy-paste solutions

- **Instructors/interviewers** looking for demonstration snippets

- **Anyone** exploring the power of functional programming in Java!

Contributions and new stream examples are welcome! Please open an issue or PR.

Let me know if you want a shorter/longer version, or want help with a README including formatting!