@@ -0,0 +1,184 @@
+public class BadOpException extends Throwable %7B%0A%09@Override%0A%09public void printStackTrace()%0A%09%7B%0A%09%09System.out.println(%22(BadOpException exception) Error! That operation is invalid.%22);%0A%09%7D%0A%7D%0A

Create BadOpException.java