Java : Accepting command line arguments for array of objects

Question

I have an array like of objects in my main

Number[] NumberArray;

The class Item has this definition:

public class Number {
    int a1;
    int a2;
}

I need to accept input from command line like say 1 2 3 4 5 6, such that

Number[1].a1 = 2

and

Number[1].a2 = 3

and

Number[4].a1 = 5

and

Number[4].a2 = 6.

How do I do this?

Please help.

For starters, your requirement is super strange. Why are you skipping entries in the array? You also don't do anything with Number[0], which is the first entry in the array. To that end, when you write public static void main(String[] args), args would hold 1 2 3 4 5 6. Have you attempted anything to parse that array in your program? If you did, where are you stuck? — Makoto
– Makoto, Commented Apr 17, 2014 at 1:19

Anubian Noob · Accepted Answer · 2014-04-17 02:02:53Z

1

In your main method:

public static void main(String[] args)

args is an array of command line parameters. To convert a String to an int, use Integer.valueOf().

For example, to get the integer value of the first commandline argument do the following:

Integer.parseInt(args[0]);

Note that this will crash if there are no arguments.

answered Apr 17, 2014 at 1:19

Anubian Noob

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1 Comment

valueOf() returns Integer, which would then auto-unboxed to int, but cleaner to use parseInt()