Constructor Summary | |
HashSet()
Constructs a new, empty set; the backing HashMap instance has default initial capacity (16) and load factor (0.75). |
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HashSet(Collection c)
Constructs a new set containing the elements in the specified collection. |
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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. |
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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 |