Java 8 Stream API helps process collections in a declarative & functional style.Ideal for filtering, mapping, reducing, and collecting data efficiently.
WHAT IS A STREAM ?
A Stream is not a data structureIt's a conveyor of data from a source (like a List)Stream operations are chained, lazy, and parallelizable
STREAM CREATION
Other ways :Stream.of() Arrays.stream()Files.lines()
Stream stream = list.stream();
INTERMEDIATE OPERATIONS
Common intermediate methods:filter()map()distinct()sorted()limit(), skip()They return a stream, enabling method chaining.
TERMINAL OPERATIONS
These trigger execution:forEach()collect()reduce()count()anyMatch()Terminal operations produce a result or side-effect.
PARALLEL STREAMS
Use parallelStream() for multi-threaded data processing.⚠️ Use wisely to avoid performance issues.
list.parallelStream() .filter(...) .collect(...);
BENEFITS OF STREAM API
✔ Code is more readable✔ Supports functional programming✔ Enables parallelism✔ Great for big data processing📖 Read full tutorial: javacody.com