how can i incorporate my reader file to my program

[blknmld69]

My program works reading from values that I have stored in an array for valid account numbers. I also have a file that reads the valid account numbers from a text file. I need to read from the text file and not the array.

reads from array

import java.util.Scanner; 
 
   public class ChargeAccount 
   { 
      static int[] validChargeAccountNumbers = 
      { 
         5658845, 4520125, 7895122, 8777541, 8451277, 1302850, 8080152, 
         4562555, 5552012, 5050552, 7825877, 1250255, 1005231, 6545231, 
         3852085, 7576651, 7881200, 4581002 
         }; 
 
      public static void main(String[] args) 
      { 
         Scanner in = new Scanner(System.in); 
 
      // Ask the user for an account number 
         System.out.print("Please enter an account number: "); 
 
      // Get the number from the user 
         int number = in.nextInt(); 
 
      // Check to see if the number is valid 
         if (ChargeAccount.isValid(number) == true) 
         { 
            System.out.println("That account number is valid."); 
         } 
 
         else 
         { 
            System.out.println("You did not enter a valid account number."); 
         } 
      } 
 
       // Check to see if an account number is valid by comparing it to the entries in the array of valid numbers 
      public static boolean isValid(int number)       
      { 
 
      // Perform sequential search through list of valid account numbers 
         for (int i = 0; i < validChargeAccountNumbers.length; i++) 
         { 
 
      // Check to see if the number we were given is at the ith position in the list 
         if (validChargeAccountNumbers[i] == number) 
         { 
            return true; 
         } 
      } 
 
      // If we get down here, then we never found it in the list 
             return false; 
      } 
   }
 

file reader

mport java.io.*;
 
 
   class FileReadTest 
   {
      public static void main (String[] args) 
      {
         FileReadTest f = new FileReadTest();
         f.readMyFile();
      }
 
      void readMyFile() 
      {
         DataInputStream dis = null;
         String record = null;
         int recCount = 0;
 
         try 
         {
            File f = new File("valid_accounts.txt");
            FileInputStream fis = new FileInputStream(f);
            BufferedInputStream bis = new BufferedInputStream(fis);
            dis = new DataInputStream(bis);
 
            while ( (record=dis.readLine()) != null ) 
            {
               recCount++;
               System.out.println(recCount + ": " + record);
            }
         } 
 
            // catch io errors from FileInputStream or readLine()
            catch (IOException e) 
            {
               System.out.println("Uh oh, got an IOException error!" + e.getMessage());
            } 
 
         finally 
         {
 
          // if the file opened okay, make sure we close it
            if (dis != null) 
            {
               try 
               {
                  dis.close();
               } 
                  catch (IOException ioe) 
                  {
                  }
            }
         }
      }
   }
 

[blknmld69]

ok let me try that

[blknmld69]

lol, now it gives this error:

ChargeAccount.java:17: unreported exception java.lang.Exception; must be caught or declared to be thrown
readMyFile("valid_accounts.txt");
^
1 error

[blknmld69]

you there?

[blknmld69]

ok I have some errands to run. Will be back on later. Hopefully this can give you an understanding of what im trying to do.

Orginal Program

 import java.util.Scanner; 
 
   public class ChargeAccount1 
   { 
      static int[] validChargeAccountNumbers = 
      { 
         5658845, 4520125, 7895122, 8777541, 8451277, 1302850, 8080152, 
         4562555, 5552012, 5050552, 7825877, 1250255, 1005231, 6545231, 
         3852085, 7576651, 7881200, 4581002 
         }; 
      public static void main(String[] args) 
      { 
         Scanner in = new Scanner(System.in); 
 
      // Ask the user for an account number 
         System.out.print("Please enter an account number: "); 
 
       // Get the number from the user 
         int number = in.nextInt(); 
 
      // Check to see if the number is valid 
         if (ChargeAccount1.isValid(number) == true) 
         { 
            System.out.println("That account number is valid."); 
         } 
 
         else 
         { 
            System.out.println("You did not enter a valid account number."); 
         } 
      } 
 
   // Check to see if an account number is valid by comparing it to the entries in the array of valid numbers 
      public static boolean isValid(int number) 
      { 
 
      // Perform sequential search through list of valid account numbers 
         for (int i = 0; i < validChargeAccountNumbers.length; i++) 
         { 
 
         // Check to see if the number we were given is at the ith position in the list 
            if (validChargeAccountNumbers[i] == number) 
            { 
               return true; 
            } 
         } 
        return false; 
      } 
   } 
 

This is my assignment:

Modify the charge account validation class that is above so it reads the list of valid charge account numbers from a file(valid_accounts.txt)

[Oralloy]

Glad to help.

Good luck with the rest of your class.

[blknmld69]

Finally got it to work Oralloy. Just wanted to let you know I appreciate all of your help. I do have another project that is due I will post tomorrow and hopefully you can help me with that.

Thanks a million!!!!!!!!!!!!

[Oralloy]

No worries. We'll do our best to help you learn this stuff. That means that we won't write the answers for you, but we're going to push you towards them, give hints, and generally try to guide your learning.

Can you give us a hint about what your main hang-ups are? Is it lack of study time? Lack of background? Just not understanding how to read manuals? Something else? We may be able to give you some pointers to help you past your hurdle.

BTW, Do you know how to get the Java class library manual on-line?

It's available here. Please add it to your browser's favorites list.

Lastly, are you taking a Computer Science or Information Technology degree, or something else?

Cheers!

[blknmld69]

Well for starters the class is only offered as a web class.(not displined) My degree is computer programming specialist. Go figure right. I picked up Visual basics and Unix/linux pretty good. Its just this Java thats giving me hangups. Added online manuels to my favorites.
Class ends on monday! :)

[Oralloy]

Good luck, Bro.

I'm in the office tomorrow until late afternoon, then gone until Monday morning; so if you need help, ask early.