String args display

Question

I understand that String args[] inside the public static void main line, is used to store arguments from the command line.

So is it possible to print what's inside args[]?

I wrote code that prints from args[0] what I entered in the scanner.

I know I can print what's inside "a" scanner but is it possible to print what's inside "b" ?

import java.util.Scanner;

public class lesson1 {

    public static void main(String args[]){
        Scanner a = new Scanner(System.in);

        String b = args[0];

        System.out.println(a);
    }
}

Are you passing arguments in? How are you running the program? Can you provide more details about why it "doesn't work"? (like what error you're getting) — mdnghtblue, Aug 04 '15 at 19:58
This is the contents of your program...how are you _running_ the program? Through Eclipse? From the command line? — mdnghtblue, Aug 04 '15 at 19:59
i'm running from eclipse . and got this error message : Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0 at apples.main(apples.java:9) — Yuvi1, Aug 04 '15 at 20:01
This is what you need to do to pass arguments: http://stackoverflow.com/questions/19646719/eclipse-command-line-arguments — mdnghtblue, Aug 04 '15 at 20:02

score 2 · Accepted Answer · answered Aug 04 '15 at 19:50

2

You can print the entire contents of args like so:

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

answered Aug 04 '15 at 19:50

mdnghtblue

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i putted this line you wrote instead of : System.out.println(a); . and i only see [] int the console – Yuvi1 Aug 04 '15 at 20:00
1

This means `args` is empty. You aren't passing any arguments to the program. – mdnghtblue Aug 04 '15 at 20:01
so user input from scanner is not an argument ? – Yuvi1 Aug 04 '15 at 20:02
3

No, it isn't. `args` are the command line arguments. The input from `Scanner` is just user input. – mdnghtblue Aug 04 '15 at 20:03
how do i pass an argument in eclipse ? – Yuvi1 Aug 04 '15 at 20:21
1

Don't forget to try googling the answer. ;) http://stackoverflow.com/questions/19646719/eclipse-command-line-arguments – mdnghtblue Aug 04 '15 at 20:23

String args display

1 Answers1