1 public class UserAss3rtion {
2 public static void makeSureItIsOK(boolean cond) {
3 if (!cond)
4 throw new IllegalStateException();
5 }
6
7 public void f(Object o) {
8 UserAss3rtion.makeSureItIsOK(o != null);
9 System.out.println(o.hashCode());
10 }
11 }