public class Empty implements Li {

	@Override
	public boolean isEmpty() {
		return true;
	}
	@Override
	public int länge() {
		return 0;
	}
	@Override
	public Li add(Li n) {
		return n;
	}
	@Override
	public Li mult(Li that) {
		return this;
	}
	@Override
	public String toString() {
		return "[]";
	}
	@Override
	public String toStringAux() {
		return "]";
	}
	
}