本文介绍了如何使用boolean参数isDaemon来创建一个Timer实例。如果isDaemon设置为true，则创建的Timer将作为守护线程运行。守护线程主要用于执行重复性的维护任务，这些任务应该在应用程序运行期间执行，但不应延长应用程序的生命周期。
public Timer(boolean isDaemon)
Creates a new timer whose associated thread may be specified to run as a daemon. A daemon thread is called for if the timer will be used to schedule repeating "maintenance activities", which must be performed as long as the application is running, but should not prolong the lifetime of the application.
如果isDaemon为true，那么创建的Timer属于守护线程，应用程序结束之后也会死亡
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