Problems with instantiating a File object from text.txt put in at args[0]

[Jai Gates]

Hi All,
This should be really basic, Just passing one file (in my project folder, triple checked that) into command line at args[0]

receiving error

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0
	at tests.LoadingArrayFromFileTest.main(LoadingArrayFromFileTest.java:26)
Java Result: 1
BUILD SUCCESSFUL (total time: 2 seconds)

The line in question is File f.... Any ideas? Suggestions?

package tests;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;

public class LoadingArrayFromFileTest{
    
    private static int row;
    private static int col;
    private int[][] A;
    private int[][] B;
    private int[][] C;
    private static ArrayList<Object> arrL1;
    
    
    public static void main(String[] args)
    {   
       File f = new File(args[0]);
      // File g = new File(args[1]);
       load2DarrayFromFile(f);
    }
    

Sincerely Stuck,
J

[Rob Spoor]

You obviously didn't provide any command line arguments to the Java program.

[Jai Gates]

The problem is I did everything that would indicate that I did. Went into Netbeans project properties, selected it as my main class, selected myText.txt as my only argument, and pressed ok.

Checked a few times to make sure the text name is correct and the text file is in project folder so don't have to specify pathname in argument.

[Jai Gates]

Even tried specifying absolute path in argument. Will try from command line too to see if something having to do with netbeans.

[Jai Gates]

What happened:

I got a 0 return in Netbeans for S.O.P(args.length); and a 1 return at command line for S.O.P(for args.length);



So it was being passed in at command line and not at Netbeans. Strange.


Finally figured out that right clicking and running one class in a project, *even* if others not connected in any way, does not give you the same results as right clicking and running the main project.

When I did the latter, I got the a 1 output in Netbeans.

*whew* ...at this rate...

Thanks.

-J

[Rob Spoor]

I'm glad you found the answer

[Campbell Ritchie]

I am not convinced that using NetBeans or return values from exit are the best way to program if you are a beginner.