class Alpha {}
class Beta extends Alpha {}

class TestClasse {
  public static void main(String[] args) {
    Alpha a = new Beta();
    Beta b = (Beta) a;
    Alpha aa = new Beta();
    char u = '\u0000';
    int x = u;
    char v = (char) x;
    byte e = 7;
    char w = (char) e;
  }
}