Java Stream API is a powerful tool introduced in Java 8 for processing collections in a functional style. It allows developers to perform operations like filtering, mapping, and reducing with concise syntax. Here's a quick overview:
📌 Core Concepts
- Stream: A sequence of elements supporting operations like
filter
,map
, andcollect
- Lambda Expressions: Used to define operations on streams
- Terminal Operations: Actions that produce a result (e.g.,
forEach
,count
)
🧩 Common Operations
filter(Predicate<T> predicate)
: Keeps elements matching a conditionmap(Function<T, R> function)
: Transforms elementsreduce(T identity, BiFunction<T, T, T> accumulator)
: Combines elements into a single value
For deeper exploration, check our Java Stream API tutorial to learn about advanced patterns and best practices. 🌐
📜 Example Code
List<String> names = Arrays.asList("Alice", "Bob", "Charlie");
names.stream()
.filter(name -> name.length() > 4)
.map(String::toUpperCase)
.forEach(System.out::println);
Explore related topics like Java 8 Features to understand how Stream API fits into modern Java development. 🚀