Two Strings Are Anagrams

public class solution {
    public static void main(String[] args) {
        String s1 = "abcd";
        String s2 = "bcda";
        System.out.println(isAnagram(s1,s2));
        System.out.println(isAnagram2(s1,s2));
    }

    public static boolean isAnagram(String s1, String s2){
        if (s1.isEmpty() || s2.isEmpty()) return false;
        if (s1.length() != s2.length()) return false;
        //error check!!!
        char[] charArr1 = s1.toCharArray();
        char[] charArr2 = s2.toCharArray();
        Arrays.sort(charArr1);
        Arrays.sort(charArr2);
        return String.valueOf(charArr1).equals(String.valueOf(charArr2));
    }

    public static boolean isAnagram2(String s1, String s2){
        if (s1.isEmpty() || s2.isEmpty()) return false;
        if (s1.length() != s2.length()) return false;
        int[] counts = new int[256];
        for (int i = 0; i < s1.length(); i++){
            counts[s1.charAt(i)] ++;
        }
        for (int j = 0; j < s2.length(); j++){
            if (--counts[s2.charAt(j)] < 0) return false;
        }
        return true;
    }
}