question: @ Override public V remove ( Object key ) { if ( key == null ) { return removeNullKey ( ) ; } int hash = secondaryHash ( key ) ; HashMapEntry < K , V > [ ] tab = table ; int index = hash & ( tab . length - 1 ) ; for ( HashMapEntry < K , V > e = tab [ index ] , prev = null ; e != null ; prev = e , e = e . next ) { if ( e . hash == hash && key . equals ( e . key ) ) { if ( prev == null ) { tab [ index ] = e . next ; } else { prev . next = e . next ; } modCount ++ ; size -- ; postRemove ( e ) ; return e . value ; } } return null ; }
target:  Removes the mapping with the specified key from this map.