要创建一个线程局部变量，请实例化类ThreadLocal的一个对象。

To create a thread-local variable, you instantiate an object of class ThreadLocal.

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在生产环境中，可能要面对以 GB 字节计算的堆，数以百计的线程，数以千计的类加载器，数以万计的类以及巨大数目的对象。

In a production environment, there may well be many gigabytes of heap, hundreds of threads, thousands of classloaders, tens of thousands of classes, and a huge number of objects.

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在stockquotegenerator类(一个单态类)的构造函数中，我们启动了一个新线程，并向该线程分配了一个Runnable对象。

In the constructor of StockQuoteGenerator class, which is a singleton class, we are starting a new thread and assigning a Runnable object to that thread.

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