顺序和倒序
//顺序
Collections.sort(value, Comparator.comparing(PpsProblemPieces::getCreateTime));
//倒序
Collections.sort(value, Comparator.comparing(PpsProblemPieces::getCreateTime).reversed());
//顺序
Collections.sort(value, Comparator.comparing(PpsProblemPieces::getCreateTime));
//倒序
Collections.sort(value, Comparator.comparing(PpsProblemPieces::getCreateTime).reversed());