https://docs.spring.io/spring-data/commons/docs/current/api/org/springframework/data/domain/PageRequest.html
https://docs.spring.io/spring-data/commons/docs/current/api/org/springframework/data/domain/Pageable.html
    ofSize(pageSize) - first page...
https://docs.spring.io/spring-data/commons/docs/current/api/org/springframework/data/domain/Page.html
    int getTotalPages
https://docs.spring.io/spring-data/commons/docs/current/api/org/springframework/data/domain/Slice.html
    if we don't need total number of items/pages
https://docs.spring.io/spring-data/commons/docs/current/api/org/springframework/data/util/Streamable.html
    toList()

Pageable firstPageWithTwoElements = PageRequest.of(0, 2);
Pageable secondPageWithFiveElements = PageRequest.of(1, 5);

Pageable sortedByName =
  PageRequest.of(0, 3, Sort.by("name"));
Pageable sortedByPriceDesc =
  PageRequest.of(0, 3, Sort.by("price").descending());
Pageable sortedByPriceDescNameAsc =
  PageRequest.of(0, 5, Sort.by("price").descending().and(Sort.by("name")));

2019
https://reflectoring.io/spring-boot-paging/
    https://github.com/thombergs/code-examples/tree/master/spring-boot/paging