Getting Started with Java Stream API

The Stream API is one of the major features introduced in Java 8. It enables functional-style operations on collections of elements.

Basic Example

Here’s a simple example of using streams to filter and transform a list of numbers:

List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5, 6);
List<Integer> evenSquares = numbers.stream()
    .filter(n -> n % 2 == 0)    // Keep only even numbers
    .map(n -> n * n)            // Square each number
    .collect(Collectors.toList());

System.out.println(evenSquares); // Output: [4, 16, 36]

Key Benefits

1. Declarative Programming: Express what you want to do, not how to do it
2. Chainable Operations: Combine multiple operations seamlessly
3. Parallel Processing: Easy parallelization with parallelStream()

Stay tuned for more Java tutorials!