code: public boolean contains(Set<?> set, Object object) {
  		if (set == null || object == null) {
  			return false;
  		}
  		
  		return set.contains(object);
  	}
docs: Check whether the given set contains the given object instance.
  
  @param set The set to check in
  @param object The object to check for
  
  @return <code>true</code> if the object is contained in the list,
  <code>false</code> otherwise
  
  @see Set#contains(Object)