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获取本周是当年的第几周​

java.time.LocalDate.now().get(java.time.temporal.WeekFields.of(java.time.DayOfWeek.MONDAY, 1).weekOfYear());
java.time.LocalDate.now().get(java.time.temporal.WeekFields.of(java.time.DayOfWeek.SUNDAY, 1).weekOfYear());

UUID​

java.util.UUID.randomUUID().toString();
java.util.UUID.randomUUID().toString().replace("-", "");
java.util.UUID.randomUUID().toString().replace("-", "").toUpperCase();