Count ocurrences of each letter in String

 Consider this program : This program calculates the Count of ocurrences of each letter in String.



import java.util.Scanner;

public class CountEachLetter
{
 public static void  main(String a[])
 {
   Scanner input = new Scanner(System.in);
  
   System.out.print("Enter a String : ");
   String s = input.nextLine();
  
   int[] counts = countLetters(s.toLowerCase());
  
   for(int i=0;i<counts.length;i++)
   {
        if(counts[i]!=0)
        System.out.println((char)('a'+i)+" appears "+ counts[i] +  ((counts[i]==1)?" time !" : " times !" ));
   
    }

 }

 public static int[] countLetters(String s)
 {
  int[] counts = new int[26];
 
  for(int i=0 ;i<s.length(); i++)
  {
    if(Character.isLetter(s.charAt(i)))
        counts[s.charAt(i)-'a']++;
  }
  return counts;
 
 }

}