Possible Exceptions

In the example program, the try{} block might throw (1) an IOException, (2) a NumberFormatException, or (3) an ArithmeticException.

  public static void main ( String[] a ) throws IOException
     . . . .

    try
    {
      System.out.println("Enter the numerator:");
      inData = stdin.readLine();
      num    = Integer.parseInt( inData );

      System.out.println("Enter the divisor:");
      inData = stdin.readLine();
      div    = Integer.parseInt( inData );

      System.out.println( num + " / " + div + " is " + (num/div) );
    }

An IOException might occur in either readLine() statement. There is no try{} block for this type of exception, so the method has to say throws IOException.

A NumberFormatException might occur in either parseInt(). The first catch{} block is for this type of exception.

An ArithmeticException might occur if the user enters data that can't be used in an integer division. A second a catch{} block is for this type of exception.