Java Stream API — Quick Guide The Stream API was introduced in Java 8 . It is used to process collections of data in a declarative way using operations such as filter() , map() , sorted() , and collect() . Basic flow List<Integer> numbers = Arrays.asList(10, 15, 20, 25, 30); List<Integer> result = numbers.stream() .filter(n -> n > 20) .map(n -> n * 2) .collect(Collectors.toList()); System.out.println(result); Output: [50, 60] Think of it as: Collection → Stream → Intermediate operations → Terminal operation → Result Important Stream API operations Operation Purpose Example filter() Select elements filter(x -> x > 10) map() Transform elements map(x -> x * 2) sorted() Sort elements sorted() distinct() Remove duplicates distinct() limit() Take first N limit(5) skip() Skip first N skip(2) forEach() Process elements forEach(System.out::println) collect() Convert to collection/result collect(Collectors.toList()) count() Count ele...
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