java util Map 体系

public interface Map<K,V> {
int size();
boolean isEmpty();
boolean containsKey(Object key);
boolean containsValue(Object value);
V get(Object key);
V put(K key, V value);
V remove(Object key);
void putAll(Map<? extends K, ? extends V> m);
Set<K> keySet();
Collection<V> values();
Set<Map.Entry<K, V>> entrySet();

}

• java.util
  AbstractMap
  Collections
  EnumMap
  HashMap
  Hashtable
  IdentityHashMap
  LinkedHashMap
  NavigableMap
  Properties
  SortedMap
  TreeMap
  WeakHashMap

• java.util.concurrent
  ConcurrentHashMap
  ConcurrentMap
  ConcurrentNavigableMap
  ConcurrentSkipListMap