am trying to store an object using a key
in a Hashtable. And some other object
already exists in that location, then
what will happen? The existing object
will be overwritten? Or the new object
will be stored elsewhere?
existing object will be overwritten and
thus it will be lost.
An enumeration is an interface containing
methods for accessing the underlying data
structure from which the enumeration is
obtained. It is a construct which collection
classes return when you request a collection
of all the objects stored in the collection.
It allows sequential access to all the elements
stored in the collection.
the basic properties of Vector and ArrayList,
where will you use Vector and where will
you use ArrayList?
basic difference between a Vector and an
ArrayList is that, vector is synchronized
while ArrayList is not. Thus whenever there
is a possibility of multiple threads accessing
the same instance, one should use Vector.
While if not multiple threads are going
to access the same instance then use ArrayList.
Non synchronized data structure will give
better performance than the synchronized