diff --git a/day08/src/com/inmind/arrays03/Demo13.java b/day08/src/com/inmind/arrays03/Demo13.java
index 19e2d00..eb28294 100644
--- a/day08/src/com/inmind/arrays03/Demo13.java
+++ b/day08/src/com/inmind/arrays03/Demo13.java
@@ -1,7 +1,23 @@
 package com.inmind.arrays03;
+
+import java.util.Arrays;
+
 /*
 Arrays练习：字符串倒序排列
 将一个随机字符串中的所有字符升序排列，并倒序打印。
  */
 public class Demo13 {
+    public static void main(String[] args) {
+        //1.定义字符串
+        String str = "akfjadkfja";
+        //2.字符串转字符数组
+        char[] chars = str.toCharArray();
+        //3.Arrays调用sort排序
+        Arrays.sort(chars);
+        //4.倒序遍历打印
+        System.out.println(Arrays.toString(chars));
+        for (int i = chars.length - 1; i >= 0; i--) {
+            System.out.println(chars[i]);
+        }
+    }
 }