Java的安排執行程序：它保證如果任務HAST尚未完成

Question

沒有人知道不平行運行，如果在java.util.concurrent中的下列Java方法包裝ScheduledExecutorService.html#scheduleAtFixedRate()

絕對保證，該計劃的Runnable會在並行的情況下，永遠不會運行在「最後」運行的可運行還不完：

例如（僞）

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. 

非常感謝您 月

Answer 1

從docs：

如果此任務的任何執行需要 比其週期長，然後 後續執行可能起步晚， 但不會同時執行。