Exception in thread “main” java.lang.ArrayIndexOutOfBoundsException: 0

Question

public class TestSample {
    public static void main(String[] args) {
        System.out.print(\"Hi, \");
        System.out.print(args[0]);
        System.out.prin         


        

Answer 1

with regards to second part of your question:

from http://download.oracle.com/javase/tutorial/essential/environment/cmdLineArgs.html :

Parsing Numeric Command-Line Arguments

If an application needs to support a numeric command-line argument, it must convert a String argument that represents a number, such as "34", to a numeric value. Here is a code snippet that converts a command-line argument to an int:

int firstArg;
if (args.length > 0) {
    try {
        firstArg = Integer.parseInt(args[0]);
    } catch (NumberFormatException e) {
        System.err.println("Argument must be an integer");
        System.exit(1);
    }
}