question: public int hashCode ( ) { if ( ! isHashCodeChosen ) { if ( name != null & type != null ) fixedHashCode = name . hashCode ( ) + 19 * type . hashCode ( ) ; else if ( name != null ) fixedHashCode = name . hashCode ( ) ; else if ( type != null ) fixedHashCode = type . hashCode ( ) ; else fixedHashCode = 1 ; isHashCodeChosen = true ; } return fixedHashCode ; }
target:  Returns a hashCode consistent with object equality. 