/**
* Searches this {@code TreeSet} for the specified object.
*
* @param object the object to search for.
* @return {@code true} if {@code object} is an element of this {@code TreeSet}, {@code false}
* otherwise.
* @throws ClassCastException when the object cannot be compared with the elements in this {@code
* TreeSet}.
* @throws NullPointerException when the object is null and the comparator cannot handle null.
*/
@Override
public boolean contains(Object object) {
return backingMap.containsKey(object);
}
/**
* Returns {@code true} if this set contains the specified element. More formally, returns {@code
* true} if and only if this set contains an element {@code e} such that
* <tt>(o==null ? e==null : o.equals(e))</tt>.
*
* @param o object to be checked for containment in this set
* @return {@code true} if this set contains the specified element
* @throws ClassCastException if the specified object cannot be compared with the elements
* currently in the set
* @throws NullPointerException if the specified element is null and this set uses natural
* ordering, or its comparator does not permit null elements
*/
public boolean contains(Object o) {
return m.containsKey(o);
}