Handling ArithmeticExceptions and InputMismatchExceptions. - Java Object Oriented Design

Java examples for Object Oriented Design:Exception

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Description

Handling ArithmeticExceptions and InputMismatchExceptions.

Demo Code

import java.util.InputMismatchException;
import java.util.Scanner;

public class Main
{
   // demonstrates throwing an exception when a divide-by-zero occurs
   public static int quotient(int numerator, int denominator)
      throws ArithmeticException
   {/*from  w  ww  .j a  v  a  2s.  c  o m*/
      return numerator / denominator; // possible division by zero
   } 

   public static void main(String[] args)
   {
      Scanner scanner = new Scanner(System.in); 
      boolean continueLoop = true; // determines if more input is needed

      do
      {
         try // read two numbers and calculate quotient
         {
            System.out.print("Please enter an integer numerator: ");
            int numerator = scanner.nextInt();
            System.out.print("Please enter an integer denominator: ");
            int denominator = scanner.nextInt();

            int result = quotient(numerator, denominator);
            System.out.printf("%nResult: %d / %d = %d%n", numerator,
               denominator, result);
            continueLoop = false; // input successful; end looping
         }
         catch (InputMismatchException inputMismatchException)
         {
            System.err.printf("%nException: %s%n",
               inputMismatchException);
            scanner.nextLine(); // discard input so user can try again
            System.out.printf(
               "You must enter integers. Please try again.%n%n");
         }
         catch (ArithmeticException arithmeticException)
         {
            System.err.printf("%nException: %s%n", arithmeticException);
            System.out.printf(
               "Zero is an invalid denominator. Please try again.%n%n");
         } 
      } while (continueLoop); 
   } 
}

Result


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