Top 5 Cool Java Streams One Liners

Java Stream one-liners every developer should know

Introduction

Java Streams provide a sleek way to process collections with clear, concise code. Streams let you handle complex operations in just a line or two, whether we're sorting, filtering, or transforming data.

This list highlights five clever one-liners that showcase the power and simplicity of Java Streams — perfect for writing clean, efficient, and expressive code.

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1. Find Elements Present in All Lists

Get the intersection of multiple collections.

2. Convert List of Objects to Map

Transform a list of objects into a map using a specific field as the key.

Transforms complex data structures with minimal boilerplate. The method references make it extremely readable.