Valid Anagram

Given two strings s and t, write a function to determine if t is an anagram of s.

For example, s = "anagram", t = "nagaram", return true. s = "rat", t = "car", return false.

Note: You may assume the string contains only lowercase alphabets.

Follow up: What if the inputs contain unicode characters? How would you adapt your solution to such case?

Solution

public class Solution {
     public boolean isAnagram(String s, String t) {
        if (s == null || t == null) return false;
        if (s.length() != t.length()) return false;

        char[] sChars = s.toCharArray();
        char[] tChars = t.toCharArray();

        Arrays.sort(sChars);
        Arrays.sort(tChars);

        for(int i = 0; i < sChars.length; i ++) {
            if (sChars[i] != tChars[i]) {
                return false;
            }
        }

        return true;
    }
}