Can you explain Java 8 Stream API with examples?

Can you explain Java 8 Stream API with examples?

Sure! The Java 8 Stream API allows you to process sequences of elements, such as collections, in a functional style. For example, you can filter, map, and reduce data easily.

Can you give me a comparison between using Stream API and traditional loops?

Absolutely! Using Stream API can lead to more concise and readable code. For instance, filtering a list of numbers to find even ones can be done in one line with Streams, while traditional loops require more lines and boilerplate code.

What are some common operations I can perform with Stream API?

Common operations include filtering, mapping, sorting, and reducing. For example, you can use filter() to select elements, map() to transform them, and reduce() to aggregate results.

Can you show me a code example of filtering a list with Stream API?

Sure! Here's a simple example:

List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5);
List<Integer> evenNumbers = numbers.stream()
    .filter(n -> n % 2 == 0)
    .collect(Collectors.toList());

This code filters out even numbers from the list.