<p style="padding-top:0px; padding-bottom:0px; margin-top:8px; margin-bottom:8px; line-height:23px; letter-spacing:0.5px; font-size:13px; color:rgb(51,51,51); font-family:微软雅黑,Verdana,sans-serif,宋体"> ThreadLocal，直译为“线程本地”或“本地线程”，如果你真的这么认为，那就错了！其实，它就是一个容器，用于存放线程的局部变量，我认为应该叫做 ThreadLocalVariable（线程局部变量）才对，真不理解为什么当初 Sun 公司的工程师这样命名。</p>
<p style="padding-top:0px; padding-bottom:0px; margin-top:8px; margin-bottom:8px; line-height:23px; letter-spacing:0.5px; font-size:13px; color:rgb(51,51,51); font-family:微软雅黑,Verdana,sans-serif,宋体"> 早在 JDK 1.2 的时代，java.lang.ThreadLocal 就诞生了，它是为了解决多线程并发问题而设计的，只不过设计得有些难用，所以至今没有得到广泛使用。其实它还是挺有用的，不相信的话，我们一起来看看这个例子吧。</p>
<p style="padding-top:0px; padding-bottom:0px; margin-top:8px; margin-bottom:8px; line-height:23px; letter-spacing:0.5px; font-size:13px; color:rgb(51,51,51); font-family:微软雅黑,Verdana,sans-serif,宋体"> 一个序列号生成器的程序，可能同时会有多个线程并发访问它，要保证每个线程得到的序列号都是自增的，而不能相互干扰。</p>
<p style="padding-top:0px; padding-bottom:0px; margin-top:8px; margin-bottom:8px; line-height:23px; letter-spacing:0.5px; font-size:13px; color:rgb(51,51,51); font-family:微软雅黑,Verdana,sans-serif,宋体"> <span style="padding:0px; margin:0px; line-height:1.5; font-size:10pt">先定义一个接口：</span></p>
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