Java Error "Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException"

Question

Here is this simple code from my book it produces error message in netbeans and in compile version (.class) version running through Command prompt.

Error Message

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0
    at intocm.Intocm.main(Intocm.java:17)

Simple Program to convert inches to centimeter.

package intocm;

public class Intocm {

    public static void main(String[] args) {
        // TODO code application logic here
        double inches;
        inches = Double.valueOf(args[0]).doubleValue();
        double cm;
        cm = inches * 2.54;
        System.out.println(cm + "Centimeters");
    }
}

The Line which Causes error is

inches = Double.valueOf(args[0]).doubleValue();

I don't know why this array "args" causing this error please help me in understanding this.

Thank you.

PermGenError · Accepted Answer · 2013-03-26 21:53:12Z

5

You are not passing command line arguments. args[0] is expecting a command line argument.

IF you are running it from command line try this:

java Intocm 12.0

In eclipse

Run---> Run Configuration--->
                            Arguments Tab--->
                                            give program arguments-->
                                                                  apply---> run

answered Mar 26, 2013 at 21:53

PermGenError

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1 Comment

Asim Qureshi Over a year ago

is there anyway i can run this in software like netbeans or eclipse without any error.

user1898811 · Accepted Answer · 2013-03-26 21:53:19Z

1

The args parameter in a class's main method is supplied by command line arguments. You are not invoking the jar with any command line args, so the array has no zero element.

answered Mar 26, 2013 at 21:53

user1898811

Comments

rgettman · Accepted Answer · 2013-03-26 21:53:38Z

1

If args[0] is causing an ArrayIndexOutOfBoundsException, then you didn't supply any command-line parameters. Test args.length; if it's 0, then handle the error.

answered Mar 26, 2013 at 21:53

rgettman

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