java实现字符串逆序的两种方法

public class test_2_13 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub

        String a = "123456";

        String one = "";
        String two = "";

        // 方法一：
        for (int i = 0; i < a.length(); i++) {
            one += a.substring(a.length() - 1 - i, a.length() - i);
        }

        // 方法二：
        StringBuffer stringBuffer = new StringBuffer(a);
        two = stringBuffer.reverse().toString();

        System.out.println("方法一输出效果:" + one);
        System.out.println("方法二输出效果:" + two);

    }

}