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

        String s="abbdfaadqwedqfdad";
        //字符串转化为字符数组
        char[] charArray = s.toCharArray();

        char[] chars = new char[s.length()];

        for (int i = 0; i < charArray.length; i++) {
            chars[i]=charArray[charArray.length-i-1];
        }
        //直接利用字符串的构造方法将字符数组转化为字符串
        String s1 = new String(chars);

        System.out.println(s1);
    }
}