@return the maximum number of elements the collection can hold
@description gets the maximum size of the collection (the bound).
file : https_github_com_apache_commons-collections_git/src/main/java/org/apache/commons/collections4/queue/CircularFifoQueue.java
file : https_github_com_apache_commons-collections_git/src/main/java/org/apache/commons/collections4/BoundedCollection.java