First Non Repeating Character

public class FirstNonRepeating {
    static final int NO_OF_CHARS = 256;
    static char count[] = new char[NO_OF_CHARS];
    
    static void getCharCountArray(String str)
    {
        for (int i = 0; i < str.length(); i++)
            count[str.charAt(i)]++;
    }
    static int firstNonRepeating(String str)
    {
        getCharCountArray(str);
        int index = -1, i;

        for (i = 0; i < str.length(); i++) {
            if (count[str.charAt(i)] == 1) {
                index = i;
                break;
            }
        }

        return index;
    }

    public static void main(String[] args) {
        String str = "algorithm";
        int index = firstNonRepeating(str);

        if(index == -1){
            System.out.println("First non-repeating character does not exists");
        }else {
            System.out.println("First non-repeating character is " + str.charAt(index));
        }
    }
}