To create a new non real-time thread the existing thread class is used unchanged.
使用现有的Thread类、不做任何改动，就能创建一个非实时线程。
Instead, the thread class was modified to support ThreadLocal by adding an instance variable to thread that holds a HashMap mapping thread-local variables to their values for the current thread.
相反地，人们通过给Thread添加一个实例变量(该变量用于保存当前线程的从线程局部变量到它的值的映射的HashMap)来修改thread类以支持ThreadLocal。
For example, if you wish to use multiple threads, implement the Runnable interface rather than extending the thread class.
举例来说，如果你希望使用多线程，实现Runnable接口比扩展Thread类好。
Provides reference documentation for the Thread class, which represents a managed thread, whether it came from unmanaged code or was created in a managed application.
类的参考文档，该类表示托管线程（无论它是来自非托管代码还是在托管应用程序中创建的）。
Provides reference documentation for the Thread class, which represents a managed thread, whether it came from unmanaged code or was created in a managed application.
类的参考文档，该类表示托管线程（无论它是来自非托管代码还是在托管应用程序中创建的）。
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