package Chapter8;

import javax.swing.JOptionPane;

public class CountEachLetter {
 /** Main method */
 public static void main(String[] args) {
 // Prompt the user to enter a string
 String s = JOptionPane.showInputDialog("Enter a string:");

 // Invoke the countLetters method to count each letter
 int[] counts = countLetters(s.toLowerCase());

 // Declare and initialize output string
 String output = "";

 // Display results
 for (int i = 0; i < counts.length; i++) {
 if (counts[i] != 0)
 output += (char)('a' + i) + " appears " +
 counts[i] + ((counts[i] == 1) ? " time\n" : " times\n");
 }

 // Display the result
 JOptionPane.showMessageDialog(null, output);
 }

 // Count each letter in the string
 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;
 }
}