code: public void foo() throws UnsupportedDataTypeException{
      try{
          throwsNumberFormatException();
          //the following methods throw exceptions which extend IOException
          throwsUnsupportedDataTypeException();
          throwsFileNotFoundException();
      }catch(FileNotFoundException | NumberFormatException ex){
          //deal with these two Exceptions without duplicating code
      }catch(IOException e){
          //deal with the UnsupportedDataTypeException as well as any other unchecked IOExceptions
          throw e;
      }
  }
  