productcodes.java

Java 程序设计教程（第五版）EXAMPLESchap10源码

//********************************************************************
//  ProductCodes.java       Author: Lewis/Loftus
//
//  Demonstrates the use of a try-catch block.
//********************************************************************

import java.util.Scanner;

public class ProductCodes
{
   //-----------------------------------------------------------------
   //  Counts the number of product codes that are entered with a
   //  zone of R and and district greater than 2000.
   //-----------------------------------------------------------------
   public static void main (String[] args)
   {
      String code;
      char zone;
      int district, valid = 0, banned = 0;

      Scanner scan = new Scanner (System.in);

      System.out.print ("Enter product code (XXX to quit): ");
      code = scan.nextLine();

      while (!code.equals ("XXX"))
      {
         try
         {
            zone = code.charAt(9);
            district = Integer.parseInt(code.substring(3, 7));
            valid++;
            if (zone == 'R' && district > 2000)
               banned++;
         }
         catch (StringIndexOutOfBoundsException exception)
         {
            System.out.println ("Improper code length: " + code);
         }
         catch (NumberFormatException exception)
         {
            System.out.println ("District is not numeric: " + code);
         }

         System.out.print ("Enter product code (XXX to quit): ");
         code = scan.nextLine();
      }

      System.out.println ("# of valid codes entered: " + valid);
      System.out.println ("# of banned codes entered: " + banned);
   }
}