针对Android 3.0平台，系统会自动为你的每一个activity应用新的主题。
By targeting the Android 3.0 platform, the system automatically applies the new holographic theme to each of your activities.
值得强调的是，除非需要向后兼容性，否则没有理由用老的队列和主题接口编写新的JMS应用程序。
It is worth stressing that, unless you require backwards compatibility, there is no reason to write new JMS applications using the old queue and topic interfaces.
应用程序代码接收新的主题，然后调用 WSSubject.setRunAsSubject(returned_subject) 方法为当前线程切换标识。
The application code receives the new subject, then invokes the WSSubject.setRunAsSubject(returned_subject) method to switch identity for the current thread.
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