https://blog.csdn.net/modestzytzh-cnhttps://blog.csdn.net/https://blog.csdn.net/modestzyt/article/details/54895503https://blog.csdn.net/modestzyt/article/details/54895503modestzytMon, 06 Feb 2017 18:02:01 +0800https://blog.csdn.net/modestzyt/article/details/54314816https://blog.csdn.net/modestzyt/article/details/54314816modestzytTue, 10 Jan 2017 16:02:21 +0800https://blog.csdn.net/modestzyt/article/details/53939242https://blog.csdn.net/modestzyt/article/details/53939242modestzytFri, 30 Dec 2016 09:26:45 +0800https://blog.csdn.net/modestzyt/article/details/12585327https://blog.csdn.net/modestzyt/article/details/12585327modestzytThu, 10 Oct 2013 20:18:52 +0800https://blog.csdn.net/modestzyt/article/details/11889279https://blog.csdn.net/modestzyt/article/details/11889279modestzytSun, 22 Sep 2013 09:34:44 +0800https://blog.csdn.net/modestzyt/article/details/6980699https://blog.csdn.net/modestzyt/article/details/6980699modestzytThu, 17 Nov 2011 10:30:13 +0800https://blog.csdn.net/modestzyt/article/details/6980695https://blog.csdn.net/modestzyt/article/details/6980695modestzytThu, 17 Nov 2011 10:29:37 +0800https://blog.csdn.net/modestzyt/article/details/6980693https://blog.csdn.net/modestzyt/article/details/6980693modestzytThu, 17 Nov 2011 10:29:09 +0800https://blog.csdn.net/modestzyt/article/details/6980685https://blog.csdn.net/modestzyt/article/details/6980685modestzytThu, 17 Nov 2011 10:28:32 +0800https://blog.csdn.net/modestzyt/article/details/6980595https://blog.csdn.net/modestzyt/article/details/6980595modestzytThu, 17 Nov 2011 10:13:40 +0800https://blog.csdn.net/modestzyt/article/details/6785084https://blog.csdn.net/modestzyt/article/details/6785084modestzytSat, 17 Sep 2011 16:18:35 +0800https://blog.csdn.net/modestzyt/article/details/5997908https://blog.csdn.net/modestzyt/article/details/5997908modestzytTue, 09 Nov 2010 16:52:00 +08001．合理使用索引 
    索引是数据库中重要的数据结构，它的根本目的就是为了提高查询效率。现在大多数的数据库产品都采用IBM最先提出的ISAM索引结构。索引的使用要恰到好处，其使用原则如下： 
●在经常进行连接，但是没有指定为外键的列上建立索引，而不经常连接的字段则由优化器自动生成索引。 
●在频繁进行排序或分组（即进行group by或order by操作）的列上建立索引。 
●在条件表达式中经常用到的不同值较多的列上建立检索，在不同值少的列上]]>https://blog.csdn.net/modestzyt/article/details/5638383https://blog.csdn.net/modestzyt/article/details/5638383modestzytTue, 01 Jun 2010 08:01:00 +0800 
1）概述
基于Object的解决方案，会有性能问题（如装箱和拆箱），而且不是类型安全的。如果要解决这种问题，可能要写特定类型的数据结构，这样一来造成代码冗余，重用率不高，一个数据结构的变更要将所有类型的数据结构做相应的修改。于是引入了泛型。

2）什么是泛型？
通过泛型可以定义类型安全类，而不会损害类型安全、性能或工作效率。
public class Stack
{
    T[] m_items;