public class Main {
    public static void main(String[] args) {
	List a = new AL();
	a.insert(42);
	a.insert(14);
	a.insert(75);
	a.insert(1);
	a.insert(5);
	System.out.println(a.size());
	// a.resize(); /* not allowed */
	((AL) a).resize(); /* type cast! */
	/* checked downcast */

	/* BAD OO STYLE BELOW! */
	if (a instanceof AL) {
	    AL b = (AL) a;
	    /* only run if a is an AL */
	}
	else if (a instanceof LL) {
	    LL b = (LL) a;
	    /* only run if a is an LL */
	}
    }
}