<p>
A positive value indicates that the cookie will expire after that many
seconds have passed. Note that the value is the <i>maximum</i> age when
the cookie will expire, not the cookie's current age.
<p>
A negative value means that the cookie is not stored persistently and
will be deleted when the Web browser exits. A zero value causes the
cookie to be deleted.
@param expiry
an integer specifying the maximum age of the cookie in
seconds; if negative, means the cookie is not stored; if zero,
deletes the cookie
Sets the maximum age in seconds for this Cookie.
<p> A positive value indicates that the cookie will expire after that many seconds have passed. Note that the value is the <i>maximum</i> age when the cookie will expire, not the cookie's current age.
<p> A negative value means that the cookie is not stored persistently and will be deleted when the Web browser exits. A zero value causes the cookie to be deleted.
@param expiry an integer specifying the maximum age of the cookie in seconds; if negative, means the cookie is not stored; if zero, deletes the cookie
@see #getMaxAge