4. Move the head to point to new Node
head = new_node ; } public void append ( int new_data ) { if ( this . head == null ) { Node n = new Node ( new_data ) ; this . head = n ; return ; } Node n1 = this . head ; Node n2 = new Node ( new_data ) ; while ( n1 . next != null ) { n1 = n1 . next ; } n1 . next = n2 ; n2 . next = null ; }