ThreadLocal和InheritableThreadLocal

ThreadLocal和InheritableThreadLocal是用于在多线程环境下存储线程局部变量的工具类。它们的本质是通过ThreadLocalMap对象来存储数据。具体来说，ThreadLocalMap的key对象是ThreadLocal，value则是实际需要存储的业务对象。在Thread类中，有两个变量分别持有ThreadLocalMap对象，即threadLocals和inheritableThreadLocals。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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