Junior — Middle

What are the main components that make up the Stream concept?

sobes.tech AI

Answer from AI

The concept of Stream in Java consists of several main components:

Source — a collection or other data set from which the stream is created (e.g., List, array).
Intermediate operations — operations that transform the stream, such as filter(), map(), sorted(). They are lazy, meaning they are executed only when necessary.
Terminal operations — operations that conclude the stream processing and return a result or side effect, such as collect(), forEach(), reduce().
Pipeline — a chain of intermediate operations ending with a terminal operation.

Example:

List<String> names = Arrays.asList("Anna", "Bob", "Charlie");

List<String> filtered = names.stream()
    .filter(name -> name.startsWith("A"))
    .map(String::toUpperCase)
    .collect(Collectors.toList());

System.out.println(filtered); // [ANNA]

Thus, Stream allows convenient and efficient processing of data sequences in a functional style.

Previous Next