Java Coding Series: How to check vowel is present in the string?

• Approach 1 : Most Useful, We will use regex to find wether vowels present in the stirng or not.

public static Boolean isVowelPresent(String sample) {        return sample.toLowerCase().matches(".*[aeiou].*");
    }

• Approach 2 : Traversing one by one and finding whether vowel is present or not using indexOf method

public static Boolean isVowelPresent(String sample) {
        char vowelArr[] = { 'a', 'e', 'i', 'o', 'u' };        for (int i = 0; i < vowelArr.length; i++) {
            char currentVowel = vowelArr[i];           if(sample.indexOf(currentVowel)!=-1){
               return true;
           }
        }
        return false;
    }
}

• Approach 3 : Traversing one by one and finding the vowel old fashion

public static Boolean isVowelPresent(String sample) {
        char vowelArr[] = { 'a', 'e', 'i', 'o', 'u' };        for (int i = 0; i < vowelArr.length; i++) {
            char currentVowel = vowelArr[i];            for (int j = 0; j < sample.length(); j++) {
                if (currentVowel == sample.charAt(j)) {
                    return true;
                }
            }
        }
        return false;
    }
}