java - Java Scheduled Executor：如果任务尚未完成，是否保证不并行运行

Question

有谁知道 java.util.concurrent 包中是否有以下 java 方法ScheduledExecutorService.html#scheduleAtFixedRate()

绝对保证，如果“最后”运行的可运行对象尚未完成，则 Runnable 计划将永远不会并行运行：

例如（伪代码）

1.00 o'clock: scheduleAtFixedRate(MyRunnable, "Run ever Hour")`
//1.30 o'clock: MyRunnable Has finished (everthing is fine)
2.00 o'clock: MyRunnable is triggered to run again
3.00 o'clock: MyRunnable has NOT yet finished ==> What will happen here? 
Will java Simply SKIP the starting of MyRunnable (as the old instance has not yet 
finished) and try again at 4 o'clock or will Java start a NEW MyRunnable that then will 
run in parallel to the "old" MyRunnable.

非常感谢简

Answer 1

从文档：

如果此任务的任何执行时间超过其周期，则后续执行可能会延迟开始，但不会同时执行。