Each of the schedule methods takes an object extending the TimerTask class as its first parameter.

每个schedule方法都采用一个扩展了timertask类的对象作为自己的第一个参数。

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The TimerTask class has a cancel method that you can use to cancel subsequent invocations of the task.

timertask类有一个cancel方法，可以用它取消对任务的后续调用。

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With the Timer class, you can have a TimerTask that runs for a long time, blocking other tasks from running.

借助timer类，您可以拥有一个长时间运行的TimerTask，阻止其他任务运行。

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