Inheritablethreadlocal

Inheritablethreadlocal和threadLocal

if (inheritThreadLocals && parent.inheritableThreadLocals != null)
            this.inheritableThreadLocals =
                ThreadLocal.createInheritedMap(parent.inheritableThreadLocals);

 类: InheritableThreadLocal
 
重写了方法
  ThreadLocalMap getMap(Thread t) {
       return t.inheritableThreadLocals;
    }

原先:
   ThreadLocalMap getMap(Thread t) {
        return t.threadLocals;
    }

如果是Inheritablethreadlocal,就会把父线程的ThreadLocalMap传递给子类. 把get方法重写了.

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