JavaDoc:http://java.sun.com/javase/6/docs/api/java/util/Map.html
Map clear() Removes all of the mappings from this map (optional operation).
Map containsKey?(Object key) Returns true if this map contains a mapping for the specified key.
Map containsValue?(Object value) Returns true if this map maps one or more keys to the specified value.
Map entrySet?() Returns a Set view of the mappings contained in this map.
Map equals?(Object o) Compares the specified object with this map for equality.
Map get?(Object key) Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.
Map isEmpty() Returns true if this map contains no key-value mappings.
Map keySet?() Returns a Set view of the keys contained in this map.
Map put(K key, V value) Associates the specified value with the specified key in this map (optional operation).
Map putAll(Map<? extends K,? extends V> m) Copies all of the mappings from the specified map to this map (optional operation).
Map remove(Object key) Removes the mapping for a key from this map if it is present (optional operation).
Map size() Returns the number of key-value mappings in this map.
Map values() Returns a Collection view of the values contained in this map.
