Polynomial.java Delete Node

    @Override
    public void deleteNode(int key) {
        Term current = this.first;
        while(current != null){
            if(((Term)current.next).getCoefficient() == key){
                Term t = (Term) current.next.next;
                current.next.next = null;
                current.next = t;
            } else {
                current = (Term) current.next;
            }
        }
    }