1. The following code segment accepts a word from the user and print the number of occurrences of each letter in the word. The program will throw an exception if you enter a non-letter string. Modify the code such that it handles exception when the user enters a non-letter string.

import java.util.Scanner;

public class CountLetters

{

public static void main(String[] args)

{

int[] counts = new int[26];

Scanner scan = new Scanner(System.in);

//get word from user

System.out.print("Enter a single word (letters only, please): ");

String word = scan.nextLine();

//convert to all upper case

word = word.toUpperCase();

//count frequency of each letter in string

for (int i=0; i < word.length(); i++)

counts[word.charAt(i)-'A']++;

//print frequencies

System.out.println();

for (int i=0; i < counts.length; i++)

if (counts [i] != 0)

System.out.println((char)(i +'A') + ": " + counts[i]);

}

}