Count each letter in the string

CountEachLetter.java

public class CountEachLetter {
  public static void main(String[] args) {
		java.util.Scanner input = new java.util.Scanner(System.in);
		System.out.println("Please enter the string: ");
		String s = input.nextLine();
		
		// Invoke the countLetters method to count each letter
		int[] counts = countLetters(s.toLowerCase());
		
		//Display results
		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."));
			}
		}
	}

	// Count each letter in the string
	private 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;
	}
}