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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);
}
}

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