Function to find the number of a certain Char in a String

Question

I'm working on a Login system in Java and am currently focusing on eMail verification. I'm trying to verify that emails only contain one "@".

To do this I've made a function to return the number of chars in a string:

    public static int numberOfCharsInString(String inputString, Character inputChar) {

        char[] stringToCharArray = inputString.toCharArray();

        int number = 0;

        for (int i = 0; i == inputString.length(); i++) {
            if (stringToCharArray[i] == (inputChar)) {
                number++;
            }
        }
        return number;
    }

There are no compilation errors and the function only returns zero. Any help would be much appreciated.

Check https://stackoverflow.com/questions/624581/what-is-the-best-java-email-address-validation-method — George Z., May 21 '19 at 12:20
`i == inputString.length()` -> `i < inputString.length()` since this condition decides if loop should iterate, but at start `i=0` which is not equal to `inputString.length()`. — Pshemo, May 21 '19 at 12:24

score 1 · Accepted Answer · answered May 21 '19 at 13:46

Please try below code, it will work

public static int numberOfCharsInString(String inputString, Character inputChar) {
    int number = 0;
    for (int i = 0; i < inputString.length(); i++) {
        if (inputString.charAt(i) == inputChar)
            number++;
    }
    return number;
}

Function to find the number of a certain Char in a String

1 Answers1