Returns a view of the portion of this set whose elements are
greater than or equal to <tt>fromElement</tt>. The returned
set is backed by this set, so changes in the returned set are
reflected in this set, and vice-versa. The returned set
supports all optional set operations that this set supports.
<p>The returned set will throw an <tt>IllegalArgumentException</tt>
on an attempt to insert an element outside its range.
@param fromElement low endpoint (inclusive) of the returned set
@return a view of the portion of this set whose elements are greater
than or equal to <tt>fromElement</tt>
@throws ClassCastException if <tt>fromElement</tt> is not compatible
with this set's comparator (or, if the set has no comparator,
if <tt>fromElement</tt> does not implement {@link Comparable}).
Implementations may, but are not required to, throw this
exception if <tt>fromElement</tt> cannot be compared to elements
currently in the set.
@throws NullPointerException if <tt>fromElement</tt> is null
and this set does not permit null elements
@throws IllegalArgumentException if this set itself has a
restricted range, and <tt>fromElement</tt> lies outside the
bounds of the range
Returns a view of the portion of this set whose elements are greater than or equal to <tt>fromElement</tt>. The returned set is backed by this set, so changes in the returned set are reflected in this set, and vice-versa. The returned set supports all optional set operations that this set supports.
<p>The returned set will throw an <tt>IllegalArgumentException</tt> on an attempt to insert an element outside its range.
@param fromElement low endpoint (inclusive) of the returned set @return a view of the portion of this set whose elements are greater than or equal to <tt>fromElement</tt> @throws ClassCastException if <tt>fromElement</tt> is not compatible with this set's comparator (or, if the set has no comparator, if <tt>fromElement</tt> does not implement {@link Comparable}). Implementations may, but are not required to, throw this exception if <tt>fromElement</tt> cannot be compared to elements currently in the set. @throws NullPointerException if <tt>fromElement</tt> is null and this set does not permit null elements @throws IllegalArgumentException if this set itself has a restricted range, and <tt>fromElement</tt> lies outside the bounds of the range