Question

Write a Java program that counts the number of alphabetic ('A' to 'Z' in both upper and lower case) and digit ('1' to '3') characters in a String. The method header is as follows:

public static int countNumAlphabetic ( String str ) {

}

Sample Output:

countNumAlphabetic("mA13Th9zB86") returns 8

Answer 1

public static int countNumAlphabetic(String str) {
    int count = 0;
    for (int i = 0; i < str.length(); i++) {
        if (Character.isAlphabetic(str.charAt(i)) || str.charAt(i) == '1' || str.charAt(i) == '2' || str.charAt(i) == '3')
            ++count;
    }
    return count;
}

public class CountNumAlphabetic {

    public static int countNumAlphabetic(String str) {
        int count = 0;
        for (int i = 0; i < str.length(); i++) {
            if (Character.isAlphabetic(str.charAt(i)) || str.charAt(i) == '1' || str.charAt(i) == '2' || str.charAt(i) == '3')
                ++count;
        }
        return count;
    }

    public static void main(String[] args) {
        System.out.println(countNumAlphabetic("mA13Th9zB86"));
    }
}