假设字符串类似这样的aba和aab，abc和bca就相等，现在随便给你二组字符串，请编程比较他们看是否相等

1. public static equals(String s1,String s2){

2.  

3. if (s1.length() != s2.length()) return false;

4. if (s1.equals(s2)) return true;

5. if (s1 == s2) return true;

6.  

7. char[] ca1 = s1.toCharArray();

8. char[] ca2 = s2.toCharArray();

9. Arrays.sort(ca1);

10. Arrays.sort(ca2);

11. return Arrays.equals(ca1,ca2);

12. }