class Mineral { }class Gem extends Mineral { }class Miner {  static int x = 7;  static String s = null;  public static void getWeight(Mineral m) {   int y = 0 / x;   System.out.print(s + " ");  }  public static void main(String[] args) {   Mineral[] ma = {new Mineral(), new Gem()};   for(Object o : ma)   getWeight((Mineral) o);  }}