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String realname = "程序员"; String mobile = "15888888888"; String realname1 =null; char[] r = realname.toCharArray(); char[] m = mobile.toCharArray(); if 阅读全文
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连接 https://www.cnblogs.com/chrischen98/p/10874821.html 阅读全文
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1 public class MapCache { 2 3 /** 4 * 默认存储1024个缓存 5 */ 6 private static final int DEFAULT_CACHES = 1024; 7 8 private static final MapCache INS = new M 阅读全文
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sql语句 select NVL(B.weight, 0),A.time from (SELECT TO_CHAR(TO_DATE(开始时间, 'yyyy-MM-dd') + ROWNUM - 1, 'yyyy-MM-dd') AS time FROM DUAL CONNECT BY ROWNUM 阅读全文