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Edit Java program for input of numbers only..

Edit Java program for input of numbers only. If the user inputs a letter the program must abort with a messegae like "Program aborted by user". Please explain the code.

import java.util.*;

public class NumberMonth

{
public static void main(String args[])

{
Scanner input = new Scanner(System.in);

while (true)

{
System.out.println("Please enter month number 1-12 to get month name (to quit press any letter': ");

int month = input.nextInt();

switch (month)

{
case 1: System.out.println("January"); break;

case 2: System.out.println("February"); break;

case 3: System.out.println("March"); break;

case 4: System.out.println("April"); break;

case 5: System.out.println("May"); break;

case 6: System.out.println("June"); break;

case 7: System.out.println("July"); break;

case 8: System.out.println("August"); break;

case 9: System.out.println("September"); break;

case 10: System.out.println("October"); break;

case 11: System.out.println("November"); break;

case 12: System.out.println("December"); break;

default: System.out.println("Wrong Input!!!");

}

}

}

}

$2.19