Java字符串倒序输出

public class s {    public static void main(String[] args){    String s="123";    String s2 = "";    for(int i=s.length()-1; i>=0; i--){//方法一    s2 = s2+s.charAt(i);    }    System.out.println(s2);    System.out.println(new StringBuffer(s).reverse());//方法二    }}