And instead of scheduling the task for execution after a fixed delay , the alarm clock uses a 这个闹钟不是计划一个任务在固定的延迟时间后执行,而是用
Allows tasks to be scheduled for repeated execution by specifying a fixed rate of execution or a fixed delay between executions 通过指定一个固定的执行频率或者固定的执行时间间隔,