Obtains an instance from this pool.
<p>
By contract, clients <strong>must</strong> return the borrowed instance
using {@link #ReturnObject}, {@link #invalidateObject}, or a related
method as defined in an implementation or sub-interface.
</p>
<p>
The behaviour of this method when the pool has been exhausted
is not strictly specified (although it may be specified by
implementations).
</p>
Obtains an instance from this pool. <p> By contract, clients <strong>must</strong> return the borrowed instance using {@link #ReturnObject}, {@link #invalidateObject}, or a related method as defined in an implementation or sub-interface. </p> <p> The behaviour of this method when the pool has been exhausted is not strictly specified (although it may be specified by implementations). </p>
@return an instance from this pool.