Explain what the following program does : import java.util.Scanner ; public class Operation $\{$ public static void main$($String$[]$ args$)\{$ Scanner scanner new Scanner$($System$.$in$)$; System.out.print $("$Enter an integer: $")$; int num scanner.nextInt $()$; try double result calculateResult $($num $)$; System.out.println $("$The result is: $"+$ result $)$; catch $($ Exception e $)\{$ System.out.println $("$Error: $"+$ e$.$getMessage $())$; $\}\}$ public static double calculateResult $($int num $)$ throws Exception if $($num $)\{$ throw new Exception $("$Negative number entered $.")$; $\}$ return Math.sqrt $($num $)$; $\}\}$