242 Valid Anagram

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[] array1 = s.toCharArray();        char[] array2 = t.toCharArray();        Arrays.sort(array1);        Arrays.sort(array2);        for(int i=0;i<s.length();++i){        if(array1[i]!=array2[i]){        return false;        }        }        return true;    }}