What is the role and benefits of using streams in the new version of Java?

Streams in Java 8+ provide a declarative approach to processing data collections.

Role of streams:

• Simplify chained operations on collections (filtering, mapping, aggregation).
• Make code more readable and concise.
• Facilitate parallel processing of data.

Advantages:

• Declarativeness: Focus on "what" needs to be done, not "how". Reduces boilerplate code.
• Lazy processing: Operations are executed only when the result is needed (for terminal operations). Saves resources.
• Parallel processing: Easy switching to parallel streams to utilize multi-core processors.

// Example of using streams
List<String> names = Arrays.asList("Alice", "Bob", "Charlie", "David");

List<String> filteredNames = names.stream()
                                  .filter(name -> name.startsWith("A")) // Filtering
                                  .map(String::toUpperCase) // Transformation
                                  .collect(Collectors.toList()); // Collecting result

// Parallel stream
long count = names.parallelStream()
                  .filter(name -> name.length() > 4)
                  .count();