ThreadLocal

1. 线程容器,给线程绑定一个 Object 内容,后只要线程不变,可以随时 取出.
   1.1 改变线程,无法取出内容.
2. 语法示例

final ThreadLocal   = new ThreadLocal<>();
threadLocal.set("测试"); new Thread(){
public void run() {
String result = threadLocal.get(); System.out.println("结果:"+result);
        };
     }.start();