Question

The following code compiles, but I get an ArrayIndexOutofBoundsException error when I try to run it. I’m learning Java by reading the Thinking in Java-book, and I pretty much copied the code from the solutions guide. Help is very much appreciated.

public class MainLine
{
    public static void main(String[] args){
    System.out.println(args[0]);
    System.out.println(args[1]);
    System.out.println(args[2]);
}

Answer 1

First, ensure you pass the arg in command line.

To prevent exception, the better way is to check the length first.

public static void main(String[] args)  {
    for (int i = 0; i < args.length; i++)  {
        System.out.println(args[i]);
    }
}