java使用valueOf的方法反转字符串输出

public class FanZhuan {
    public static void main(String[] args) {

        String s = "987654321088123about我是谁";
        System.out.println("直接输出：" + s);
        String str = String.valueOf(s);
        String reverseStr = "";
        for (int i = str.length()-1; i >=0; i--) {
            reverseStr +=str.charAt(i);
        }
        System.out.println("反转输出："+reverseStr);
    }
}