V function ( V arg0 ) { throw new UnsupportedOperationException ( ) ; }
always throws unsupportedoperationexception , as this class represents an immutable map entry . concode_field_sep V value concode_elem_sep K key concode_field_sep MapEntry<K,V> entry concode_elem_sep K getKey concode_elem_sep V getValue concode_elem_sep int hashCode concode_elem_sep boolean equals concode_elem_sep String toString