Java replace a character in a string

TEbogo :

I am writing a method to replace all vowels in a string with a given character, but it does not work for strings with more than one vowel. It works for "heel" but not for "hello". Please help. My code below:

public Boolean isVowel(char ch){

        char ch2 = Character.toLowerCase(ch); 
        char[] vowels = {'a', 'e', 'i', 'o', 'u'};

        for(int i = 0; i < vowels.length; i++){
            if (ch2 == vowels[i]) {
                return true;
            }
        }
            return false;
    }

    public String replaceVowels(String phrase, char ch){
        String newP = "";
        for(int i = 0; i < phrase.length(); i++){  
            char c = phrase.charAt(i);
            Boolean vowel = isVowel(c);

            if(vowel){ 
               newP = phrase.replace(c, ch);
            }
        }

        return newP;
    }

Alex :

public String replaceVowels(final String phrase,final String ch) {
    return phrase.replaceAll("[aeiou]", ch);
}

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