CheckVowels.java

package com.thealgorithms.strings;

import java.util.Set;

/**
 * Vowel Count is a system whereby character strings are placed in order based
 * on the position of the characters in the conventional ordering of an
 * alphabet. Wikipedia: https://en.wikipedia.org/wiki/Alphabetical_order
 */
public final class CheckVowels {
 private static final Set<Character> VOWELS = Set.of('a', 'e', 'i', 'o', 'u');

 private CheckVowels() {
 }

 /**
 * Checks if a string contains any vowels.
 *
 * @param input a string to check
 * @return {@code true} if the given string contains at least one vowel, otherwise {@code false}
 */
 public static boolean hasVowels(String input) {
 if (input == null || input.isEmpty()) {
 return false;
 }

 for (char c : input.toLowerCase().toCharArray()) {
 if (VOWELS.contains(c)) {
 return true;
 }
 }
 return false;
 }
}