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Once an element has been placed in a vector, you can
retrieve that element
using the elementAt method with an integer argument. For example,
the following expression retrieves the element identified by an integer
variable, counter, from the vector, v:
v.elementAt(counter)
Similarly, you can
replace an element using the setElementAt method.
For example, the following expression replaces the element identified by
the value of an integer variable, counter, by the instance assigned
to the instance variable, m:
v.setElementAt(m, counter)
Thus, elementAt and setElementAt allow you to use a vector as
though it were an array.