Java.Collections.Arrange the following interfaces in a hierarchy: List, Set, Map, SortedSet, SortedMap,

Here’s the hierarchical structure of the given interfaces in the Java Collections Framework (JCF):

            ┌──────────────────────┐
            │      Iterable<E>      │  (Superinterface of Collection)
            └──────────▲───────────┘
                       │
             ┌─────────┴──────────┐
             │  Collection<E>      │  (Root interface for List & Set)
             └─────────▲──────────┘
                       │
       ┌──────────────┴──────────────┐
       │                             │
     List<E>                        Set<E>   
       │                              │
       │                              ├───────────┐
       │                              │           │
       │                          SortedSet<E>  (Set with ordering)
       │                              │
       │                              ▼
       │                          NavigableSet<E> (Extends SortedSet)
       ▼
   (Implementations: ArrayList, LinkedList, Vector, Stack)
   
──────────────────────────────────────────────────────────
                      Map<K, V>  (Separate hierarchy)
                          │
                          ├──────────────┐
                          │              │
                     SortedMap<K, V>  (Map with ordering)
                          │
                          ▼
                  NavigableMap<K, V>  (Extends SortedMap)

Explanation of Hierarchy:

  1. Iterable<E> – The topmost interface, allowing iteration over elements.
  2. Collection<E> – Extends Iterable<E> and serves as the root for List<E> and Set<E>.
  3. List<E> – Ordered collection (e.g., ArrayList, LinkedList).
  4. Set<E> – Unordered collection, no duplicates (e.g., HashSet).
    • SortedSet<E> – A Set with elements stored in sorted order (e.g., TreeSet).
    • NavigableSet<E> – Extends SortedSet with navigation methods like higher(), lower().
  5. Map<K, V> – A separate hierarchy that stores key-value pairs.
    • SortedMap<K, V> – A Map where keys are stored in sorted order (e.g., TreeMap).
    • NavigableMap<K, V> – Extends SortedMap, providing extra methods for navigation (e.g., TreeMap).

Key Takeaways:

  • Collection<E> is the root for List<E> and Set<E>, but Map<K, V> is a separate hierarchy.
  • SortedSet<E> and SortedMap<K, V> enforce natural ordering or a custom comparator.
  • NavigableSet<E> and NavigableMap<K, V> provide enhanced navigation methods.
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