使用递归算法反转字符串

public class T {

    //反转字符串

    public static String reverseString(String s){

        if(s.isEmpty()) return s;

        return reverseString(s.substring(1))+s.charAt(0);

    }

    

    public static void main(String[] args) {

        System.out.println(reverseString("123456789"));

    }

}