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class SensitiveHash {
  private Hashtable<Integer,String> ht = new Hashtable<Integer,String>();

  public void removeEntry(Object key) {
    ht.remove(key);
  }
}

class SensitiveHash {
  private Hashtable<Integer,String> ht = new Hashtable<Integer,String>();

  public void removeEntry(Object key) {
    check("removeKeyPermission");
    ht.remove(key);
  }

  private void check(String directive) {
    SecurityManager sm = System.getSecurityManager();
    if (sm != null) {
      sm.checkSecurityAccess(directive);
    }
  }
}