UUID生成純數字ID

UUID

public class UUIDUtils { public static String getUUID(){ return UUID.randomUUID().toString().replace("-",""); } public static Integer getUUIDInOrderId(){ Integer orderId=UUID.randomUUID().toString().hashCode(); orderId = orderId < 0 ? -orderId : orderId; //String.hashCode() 值會爲空
        return orderId; } public static void main(String[] args){ for (int i = 0; i<100; i++) System.out.println(UUIDUtils.getUUIDInOrderId()); } }