public Href with ( final Object key , final Object value ) { final SortedMap < String , List < String > > map = new TreeMap <> ( this . params ) ; if ( ! map . containsKey ( key . toString ( ) ) ) { map . put ( key . toString ( ) , new LinkedList <> ( ) ) ; } map . get ( key . toString ( ) ) . add ( value . toString ( ) ) ; return new Href ( this . uri , map , this . fragment ) ; }
Add this extra param .