A DESCRIPTION OF THE PROBLEM :
In the Japanese page ( https://docs.oracle.com/javase/jp/8/docs/api/java/util/ArrayDeque.html ), "run in amortized constant time" is translated into "一定の償却時間で実行されます".
I strongly believe this is mistranslation and should be translated into "償却定数時間で実行されます".



URL OF FAULTY DOCUMENTATION :
https://docs.oracle.com/javase/jp/8/docs/api/java/util/ArrayDeque.html