List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);

// Filter even numbers
List<Integer> evens = numbers.stream()
    .filter(n -> n % 2 == 0)
    .collect(Collectors.toList());

// Map to squares
List<Integer> squares = numbers.stream()
    .map(n -> n * n)
    .collect(Collectors.toList());

// Sum all numbers
int sum = numbers.stream()
    .reduce(0, Integer::sum);

// Find maximum
Optional<Integer> max = numbers.stream()
    .max(Integer::compareTo);

// Group by even/odd
Map<Boolean, List<Integer>> grouped = numbers.stream()
    .collect(Collectors.partitioningBy(n -> n % 2 == 0));

// Parallel processing
List<Integer> doubled = numbers.parallelStream()
    .map(n -> n * 2)
    .collect(Collectors.toList());

// Chain operations
List<String> result = numbers.stream()
    .filter(n -> n > 5)
    .map(n -> "Number: " + n)
    .sorted()
    .collect(Collectors.toList());