Compare the "Methods declared in interface java.util.List" sections on these two pages:

1. https://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/util/ArrayList.html
2. https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/util/ArrayList.html

The former section lists 5 methods (containsAll, equals, hashCode, replaceAll, sort), while the latter lists only 3 methods (containsAll, replaceAll, sort).

This looks surprising as it cannot seemingly be explained by changes in ArrayList's hierarchy and thus should be investigated. Perhaps there are other differences on that page that are not caused by changes in ArrayList's hierarchy.