Eclipse Commandline Arguments with String[] args

Question

I need to enter a String input, format it, and display the output in a certain format. I'm supposed to use the Run > Run Configuration > Arguments > Program Argument and I entered in any string (ie. "test") in the Program arguments section. When I try to run the java application, I keep getting an error message in the Console window. How do I use the Commandline arguments? What should I enter in the program arguments? Any help with this, would be greatly appreciated. Thanks.

Below is the error message that I get in the Console window:

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 1
    at a00752124.data.InventoryReader.read(InventoryReader.java:26)
    at a00752124.Lab2.<init>(Lab2.java:38)
    at a00752124.Lab2.main(Lab2.java:28)

Below is my sourcecode for the main class:

public class Lab2 {

    /**
     * Main method of Lab2 class
     * 
     * @param args
     */
    public static void main(String[] args) {
        new Lab2(args[0]);
    }

    /**
     * Constructor for Lab2 class
     * 
     * @param itemCount
     */
    public Lab2(String itemCount) {

        Item[] items = InventoryReader.read(itemCount);

        System.out.println(Arrays.toString(items));

        InventoryReport.display(items);
        }

    }

Here's the source code for my InventoryReader's read method:

public static Item[] read(String input) {
        String[] rows = input.split(":");
        Item[] items = new Item[rows.length];

        int i = 0;
        for (String row : rows) {

            String[] element = row.split("\\|");
            items[i] = new Item(element[0], element[1], Integer.valueOf(element[2]), Float.valueOf(element[3]));
            i++;


        }

        return items;
    }

The exception occurred in InventoryReader.read() method. Can you show us that method? The exactl location is InventoryReader.java line 26. — Bhesh Gurung
– Bhesh Gurung, Commented Apr 20, 2014 at 18:38
Hi Thank you for your input. I added the source code for my InventoryReader's read method above. — user3078337
– user3078337, Commented Apr 20, 2014 at 18:43
It seems u need to give input with : as row delimiter and | as column delimiter with 4 elements in row — GoldRoger
– GoldRoger, Commented Apr 20, 2014 at 18:55
Thanks I tried that but it's still giving errors. I'm still getting an exception thrown from the line "items[i] = new Item(element[0], element[1], Integer.valueOf(element[2]), Float.valueOf(element[3]));" — user3078337
– user3078337, Commented Apr 20, 2014 at 20:42

PM 77-1 · Accepted Answer · 2014-04-20 18:52:17Z

2

You have:

String row = "";

then:

String[] element = row.split("\\|");

What is the size of element after you split an empty string?

Right after you assume that element has at least 4 items.

items[i] = new Item(element[0], element[1], Double.valueOf(element[2]), Double.valueOf(element[3]));

Clear enough?

answered Apr 20, 2014 at 18:52

PM 77-1

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2 Comments

user3078337 Over a year ago

Thanks for your help. I fixed the InventoryReader's read method but I'm still getting errors. It's throwing an exception on the line "items[i] = new Item(element[0], element[1], Integer.valueOf(element[2]), Float.valueOf(element[3]));" Any ideas?

PM 77-1 Over a year ago

I believe it's still the same error. To test your assumption about the size of your element array place System.out.println(element.length); before the problematic statement or (even better) use a debugger and put a breakpoint on this line.

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