Java Collection means a single unit of objects. Java Collection framework provides many interfaces (Set, List, Queue, Deque) and classes (ArrayList, Vector, LinkedList, PriorityQueue, HashSet, ...

import java.util.ArrayList; import java.util.Calendar; import java.util.List; /** * Build up some sample objects and throw them at the Instrumentation example. * * Might run this class as shown ...

all the collection classes in the JDK hold data as objects. If a developer has a set of int values they want to store in an ArrayList, it can’t be done. Unless, of course, they use a corresponding ...