diff --git a/boot-service/src/main/java/com/xwbing/demo/Ademo.java b/boot-service/src/main/java/com/xwbing/demo/Ademo.java
index 83ec461..a3f9b0c 100644
--- a/boot-service/src/main/java/com/xwbing/demo/Ademo.java
+++ b/boot-service/src/main/java/com/xwbing/demo/Ademo.java
@@ -1,10 +1,5 @@
 package com.xwbing.demo;
 
-import com.alibaba.fastjson.JSONArray;
-
-import java.util.HashMap;
-import java.util.Map;
-
 /**
  * 项目名称: boot-module-demo
  * 创建时间: 2018/1/23 14:45
@@ -13,13 +8,5 @@ import java.util.Map;
  */
 public class Ademo {
     public static void main(String[] args) {
-        Map<String, String> aa = new HashMap<>();
-        aa.put(null, "aa");
-        String s = aa.get(null);
-        System.out.println(s);
-        JSONArray jsonArray = JSONArray.parseArray("[1,2]");
-        System.out.println("");
-
     }
-
 }
diff --git a/boot-service/src/main/java/com/xwbing/demo/CollectionDemo.java b/boot-service/src/main/java/com/xwbing/demo/CollectionDemo.java
index 85e6e81..14d7ece 100644
--- a/boot-service/src/main/java/com/xwbing/demo/CollectionDemo.java
+++ b/boot-service/src/main/java/com/xwbing/demo/CollectionDemo.java
@@ -19,6 +19,8 @@ public class CollectionDemo {
         int[] arr1 = new int[4];
         int[] arr2 = new int[]{1, 3, 5, 7};
         int[] arr3 = {12, 3, 5, 6, 2, 8, 9, 4};
+        //输出字符串
+        System.out.println(Arrays.toString(arr3));
 
         for (int i = 0; i < arr3.length - 1; i++) {//选择排序
             for (int j = i + 1; j < arr3.length; j++) {