java.util
Class HashSet


Constructor Summary
HashSet()
          Constructs a new, empty set; the backing HashMap instance has default initial capacity (16) and load factor (0.75).
HashSet(Collection c)
          Constructs a new set containing the elements in the specified collection.
HashSet(int initialCapacity)
          Constructs a new, empty set; the backing HashMap instance has the specified initial capacity and default load factor, which is 0.75.
HashSet(int initialCapacity, float loadFactor)
          Constructs a new, empty set; the backing HashMap instance has the specified initial capacity and the specified load factor.
 
Method Summary
 boolean add(Object o)
          Adds the specified element to this set if it is not already present.
 void clear()
          Removes all of the elements from this set.
 Object clone()
          Returns a shallow copy of this HashSet instance: the elements themselves are not cloned.
 boolean contains(Object o)
          Returns true if this set contains the specified element.
 boolean isEmpty()
          Returns true if this set contains no elements.
 Iterator iterator()
          Returns an iterator over the elements in this set.
 boolean remove(Object o)
          Removes the specified element from this set if it is present.
 int size()
          Returns the number of elements in this set (its cardinality).
 
Methods inherited from class java.util.AbstractSet
equals, hashCode, removeAll
 
Methods inherited from class java.util.AbstractCollection
addAll, containsAll, retainAll, toArray, toArray, toString
 
Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait
 
Methods inherited from interface java.util.Set
addAll, containsAll, equals, hashCode, removeAll, retainAll, toArray, toArray