Java tutorial
import org.apache.commons.lang.CharSet; public class MainClass { public static void main(String[] args) { //Create a new vowel character set CharSet vChs = CharSet.getInstance("aeiou"); String strTest = "The quick brown fox jumps over the lazy dog."; int iVowelCnt = 0; int iTestLen = strTest.length(); for (int i = 0; i < iTestLen; i++) { if (vChs.contains(strTest.charAt(i))) { iVowelCnt++; //increment count on a vowel being found } } System.out.println("String >>" + strTest); System.out.println("Number of vowels in the string is " + iVowelCnt); } }