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public interface Bag<E>
A bag is a read-only collection that is non-unique and unordered. It is,
therefore, like a set except that any element may occur multiple times. All
modifying operations will throw an UnsupportedOperationException
.
Note, that no specific Object.equals(Object)
or Object.hashCode()
requirements are added by this interface. This means that implementations may
simply use the Object
-provided, identity-based comparison semantics.
Method Summary | |
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int |
count(java.lang.Object o)
Queries how many times the specified object occurs in me. |
Methods inherited from interface java.util.Collection |
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add, addAll, clear, contains, containsAll, equals, hashCode, isEmpty, iterator, remove, removeAll, retainAll, size, toArray, toArray |
Method Detail |
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int count(java.lang.Object o)
o
- an object
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