Memo
List<Integer> list = IntStream.range(1, 13).boxed().collect(Collectors.toList());
list.stream().forEach(System.out::println);
results
1
2
3
4
5
6
7
8
9
10
11
12
================
UnaryOperator<String> stringUpperCase = (s)->s.toUpperCase();
System.out.println( stringUpperCase.apply("abc") );
results
ABC