List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5); List<Integer> evenSquares = numbers.stream() .filter(n -> n % 2 == 0) .map(n -> n * n) .collect(Collectors.toList()); List<String> names = Arrays.asList("Alice", "Bob", "Charlie"); Predicate<String> startsWithA = name -> name.startsWith("A"); List<String> filteredNames = names.stream() .filter(startsWithA) .collect(Collectors.toList());