List<Integer> list = Lists.immutable.of(1, 2, 3); MutableList<Integer> list = Lists.mutable.of(1, 2, 3); list.add(4); List<Integer> list = Lists.mutable.of(1, 2, 3, 4, 5); int sum = list.stream().filter(i -> i % 2 == 0).mapToInt(Integer::intValue).sum(); List<Integer> list = Lists.mutable.of(1, 2, 3, 4, 5); List<Integer> squaredList = list.collect(i -> i * i); List<Integer> list = Lists.mutable.of(1, 2, 3, 4, 5); Set<Integer> set = Sets.mutable.of(1, 2, 3, 4, 5);