For each of the following programs, determine whether or not they are valid Java pro- grams without typing them in. If they are valid, indicate what they output. If not, explain why (be precise) (a) public class Shadowl public static void main (String[] args) int i = 0; System.out.println(i); int j = 1; System.out.println (j); int i = j; System. out.println (i); (b) public class Shadow2 i public static void main (String[] args) [ int i; for (int i = 0; i