public boolean exists(K k) {
		Key<K> key = keys.get(k);
		if(key != null) {
			return objects.get(key) != null;
		}
		return false;
	}
public boolean exists(K k) {
		Key<K> key = keys.get(k);
		if(key != null) {
			return objects.get(key) != null;
		}
		return false;
	}
public boolean exists ( K k ) { Key < K > key = keys . get ( k ) ; if ( key != null ) { return objects . get ( key ) != null ; } return false ; }
Returns true if the object with the given key resides in the cache.
@param k
@return true if the object with the given key resides in the cache.
Returns true if the object with the given key resides in the cache .