why exception 'ArrayIndexOutofBoundException' accur in

Question

public class Program
{
public static void main(String[] args)
{
int x,y;
x=Integer.parseInt(args[0]);
y=Integer.parseInt(args[1]);
System.out.println((x+y));
}
}

Answer 1

To check if there are any arguments:
for (int i=0, i<args.length; i++)
System.out.println(args[i]);

Answer 2

main is probably being called without arguments and your args array is empty.

You are trying to read args[0] and args[1] without checking if it has values.

Try using an if statement:

if (args.length >=2) // if args has at least two values
{
x=Integer.parseInt(args[0]); // read value 1
y=Integer.parseInt(args[1]); // read value 2
System.out.println((x+y));
}

Answer 3

FOR statements should not be used for checking if there are items in a list. What happens when you have an array with thousands of values. Or a dataset with millions of records?