Java Collection Framework - Map Interface

The Map interface is not an extension of Collection
interface. Instead the interface starts of it?s own
interface hierarchy, for maintaining key-value associations.
The interface describes a mapping from keys to values,
without duplicate keys, by defination.
The Map interface follows.

    public interface Map<K,V> {

        // Basic operations
        V put(K key, V value);
        V get(Object key);
        V remove(Object key);
        boolean containsKey(Object key);
        boolean containsValue(Object value);
        int size();
        boolean isEmpty();

        // Bulk operations
        void putAll(Map<? extends K, ? extends V> m);
        void clear();

        // Collection Views
        public Set<K> keySet();
        public Collection<V> values();
        public Set<Map.Entry<K,V>> entrySet();

        // Interface for entrySet elements
        public interface Entry {
            K getKey();
            V getValue();
            V setValue(V value);
        }
    }

Map interface provides classes and interfaces to do
operations with objects saved as key value pairs