ImmutableList<String> names = ImmutableList.of("Alice", "Bob", "Charlie"); List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5); List<Integer> evenNumbers = numbers.stream() .filter(n -> n % 2 == 0) .collect(Collectors.toList()); Map<String, String> cache = new MapMaker() .setDefaultSupplier(() -> "default") .makeMap();