diff --git a/day07/src/com/inmind/arraylist03/Test11.java b/day07/src/com/inmind/arraylist03/Test11.java
new file mode 100644
index 0000000..aa976ca
--- /dev/null
+++ b/day07/src/com/inmind/arraylist03/Test11.java
@@ -0,0 +1,34 @@
+package com.inmind.arraylist03;
+
+import java.util.ArrayList;
+
+//常用类-ArrayList-练习1_添加小数
+public class Test11 {
+    public static void main(String[] args) {
+        //创建一个保存小数的集合 double
+        ArrayList<Double> list = new ArrayList<Double>();
+        list.add(1.1);
+        list.add(1.2);
+        list.add(1.3);
+        list.add(1.4);
+        list.add(1.5);
+        list.add(1.6);
+        System.out.println(list);
+        System.out.println("----------------------");
+        //我想将集合中每个元素都取出，怎么办？？？
+        /*System.out.println(list.get(0));
+        System.out.println(list.get(1));
+        System.out.println(list.get(2));
+        System.out.println(list.get(3));//是否可以多取一个？？？*/
+        //集合的遍历 .fori 正向遍历
+        for (int i = 0; i < list.size(); i++) {
+            System.out.println(list.get(i));
+        }
+
+        System.out.println("----------------------");
+        //.forr 反向遍历
+        for (int i = list.size() - 1; i >= 0; i--) {
+            System.out.println(list.get(i));
+        }
+    }
+}