question: @ Override public V remove ( Object key ) { poll ( ) ; int index = 0 ; Entry < K , V > entry , last = null ; if ( key != null ) { index = ( Collections . secondaryHash ( key ) & 0x7FFFFFFF ) % elementData . length ; entry = elementData [ index ] ; while ( entry != null && ! key . equals ( entry . get ( ) ) ) { last = entry ; entry = entry . next ; } } else { entry = elementData [ 0 ] ; while ( entry != null && ! entry . isNull ) { last = entry ; entry = entry . next ; } } if ( entry != null ) { modCount ++ ; if ( last == null ) { elementData [ index ] = entry . next ; } else { last . next = entry . next ; } elementCount -- ; return entry . value ; } return null ; }
target:  Removes the mapping with the specified key from this map.