Anagram checker

public class Main {

    public static void main(String[] args) {
        System.out.println(anagram("abefgchd", "abcdefgh"));
    }

    // Write a method to decide if two strings are anagrams or not.
    public static boolean anagram(String str1, String str2) {
        if (str1.length() != str2.length()) {
            return false;
        }
        int[] abc = new int[256];

        for (int i = 0; i < str1.length(); i++) {
            int index = str1.charAt(i);
            abc[index]++;
        }

        for (int i = 0; i < str2.length(); i++) {
            int index = str2.charAt(i);
            abc[index]--;
            if (abc[index] < 0) {
                return false;
            }
        }

        return true;
    }

}