Java中的UUID

UUID生成的是128位长整型数字，转成字符串用4个“-”分隔的32个十六进制数字

import java.util.UUID;

public class Test5 {

    public static void main(String[] args) {

        UUID uuid = UUID.randomUUID();

        System.out.println(uuid.toString());

        System.out.printf("去掉\"-\"符号：%s\n", uuid.toString().toString().replace("-", ""));

    }
}

b65da2dc-e6bb-4665-8c85-8c24b6d0794e
去掉"-"符号：b65da2dce6bb46658c858c24b6d0794e