// Java
class Problem extends Exception{
  Problem(){super();}
  Problem(String s) {super(s);}
}

public class CatchOrSpecifyDemo0 {

  public static void main(String[] args){   
      explosion();      // Compile-time error:
                        //   unreported exception Problem;
                        //   must be caught or declared to be thrown
  }

  static void explosion() throws Problem {    
    System.out.println("Explosion!");
    throw new Problem("We have an explosive problem");
  }

}