Why `java.lang.ArrayIndexOutOfBoundsException: 0` with `main` method arguments [closed]

Answer 1

JVM throw exception bcoz no element exist at index 0 in the array.So provide the parameter during running the class or just add below code so that no exception will raise :

    if(args.length >= 1)
       {
           System.out.println(formattedDate + "> Hello, " + args[0] + "!"); 
       }

Pass the argument as below :

java My.Hello BHARAT

Answer 2

You need to pass arguments from the command line.Refer the official docs.

Code:

package My;

import java.text.SimpleDateFormat;
import java.util.Date;
public class Hello {
    public static void main(String[] args) {
        Date now = new Date();
        SimpleDateFormat formatter =
        new SimpleDateFormat("MMM/dd/yyyy HH:mm:ss");
        String formattedDate = formatter.format(now);
        System.out.println(formattedDate + "> Hello, " + args[0] + "!");
    }
}

Compilation and Execution: