CODEWITHSUNDEEP
javaarrays
user3199559
user3199559

Reputation: 1

How do I fix an arrayindexoutofboundsexception error?

this is the code I am dealing with

public class NameTag
{
    public static void main (String[] args)
    {
        System.out.println ();
        System.out.println ("   " + args[0]);
        System.out.println ("My name is " + args[1]);
        System.out.println ();
    }
}

this is the error that keeps showing each time I try to run the program java.lang.ArrayIndexOutOfBoundsException: 0 at NameTag.main(NameTag.java:6)

I am using BlueJ Version 3.1.0 *I have no idea how to fix this error, I have tried many different things but nothing is working. Please help.*

Upvotes: 0

Views: 457

Answers (3)

Neeraj Krishna
Neeraj Krishna

Reputation: 1615

Check for the length of the array before doing any other operations.

public static void main (String[] args)
{
    if(args.length > 1) {
       System.out.println ();
       System.out.println ("   " + args[0]);
       System.out.println ("My name is " + args[1]);
       System.out.println ();
    }
}

Upvotes: 1

user2685079
user2685079

Reputation: 104

On blueJ, when you run, make sure you enter your input in the correct way and not empty. It will take your input and evaluate args[0] and args[1] from the input. It throws the exception when it can't find any argument.

Upvotes: 0

Martin Dinov
Martin Dinov

Reputation: 8815

That means you haven't passed any arguments to the program at execution. Therefore, accessing args[0] and args[1] leads to the ArrayIndexOutOfBoundsException. http://www.bluej.org/help/archive.html#tip9 explains how to pass command line arguments to BlueJ. To save you the trouble of following the link, pass the following parameter to main:

{ "foo", "bar" }

to have the String "foo" in args[0] and "bar" in args[1]. Also, it's good practice to check the length of the args array before doing anything with it, to make sure that arguments have indeed been passed.

Upvotes: 2

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