threadlocal工具类定义

ThreadLocal是JDK提供的线程局部变量工具类。它定义了两个类型为ThreadLocalMap的变量：threadLocals和inherittableThreadLocals。threadLocals是用于存储线程本地变量的，它是ThreadLocal的独占变量。inherittableThreadLocals是可共享的变量，它也是ThreadLocalMap类型的，用于存储可被继承的线程本地变量。ThreadLocalMap是ThreadLocal的静态内部类，类似于Map的键值对存储结构。通过ThreadLocal的set方法将值添加到threadLocals中，并通过get方法获取当前线程变量中的threadLocals的值。如果需要移除值，则调用remove方法。ThreadLocal作为一个Key，用来让线程获取线程的局部变量。InheritableThreadLocal继承自ThreadLocal，并重写了getMap和createMap方法，唯一的区别是将ThreadLocal中的threadLocals换成了inherittableThreadLocals。这两个变量都是ThreadLocalMap类型，并且都是Thread类的属性。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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