Re: Need assistance with arrays

From:

RookThis <notagainok@yahoo.com>

Newsgroups:

comp.lang.java.programmer

Date:

Sat, 17 Nov 2007 08:29:37 -0800 (PST)

Message-ID:

<155ea6ad-c94e-4e7e-b9c9-7847b663d4f3@w34g2000hsg.googlegroups.com>

On Nov 17, 10:23 am, Patricia Shanahan <p...@acm.org> wrote:

RookThis wrote:

I'm new to Java and trying to understand the array process. I have
file that I am trying to read in and populate an array with the
data. I have this so far, but still having problems. Can someone
tell me what I'm doing wrong? Thank you!

public class test
{
     public static void main (String [] args)throws Exception
     {
         Scanner ifile1 = new Scanner(new File("input.txt"));
         String type = " ";
         String color = " ";
         String description = " ";
         String make = " ";
         int ccount = 0;
         int index = 0;
         carFile[] items = new carFile[50];

This creates an array of 50 null carFile references.

         while (ifile1.hasNext())
             {
                 type = ifile1.next();
                 color = ifile1.nextInt();
                 description = ifile1.next();
                 make = ifile1.nextLine();
                 items[index].setType(type);

You need to make items[index] point to an object, instead of being null,
before you can operate on the object it points to. Perhaps:

items[index] = new carFile();

before this line.

                 items[index].setColor(color);
                 items[index].setDescription(description);
                 items[index].setMake(make);
                 index++;
             }
         ifile1.close();

      }
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Thanks for the response, I really appreciate the assistance. Are you
saying to enter that line as the first line after the while statement?