Java 9 Programming By Example

Interface collection

Collection is the top of the interface hierarchy. This interface defines the methods that all implementations should provide, no matter if they implement the Set, SortedSet, List, Queue, or Deque interface directly. As Collection simply says that an object that implements the Collection interface is only an object that collects other objects together, the methods it defines are like adding a new object to the collection, clearing all elements from there, checking that an object is already a member of the collection, and iterating through the elements.

For an up-to-date definition of the interface, consult the Java pi documentation (http://download.java.net/java/jdk9/docs/api/overview-summary.html). You can consult the ...