Where key is the object added on HashSet and value is constant object as PRESENT in java.util.HashSet. When we create HashSet Object, internally create an object of HashMap. As we know in HashMap each key is unique so, When we call add(E e) method this pa

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, LinkedHashSet, TreeSet). What is Collection in Java. A Collect

This Tutorial Explains all about TreeSet Class, Implementation, Iteration, TreeSet Vs HashSet, Java TreeSet Examples, etc.: TreeSet in Java implements the Set interface (more specifically SortedSet). The TreeSet uses a TreeMap internally for storing data.