diff --git a/s-day02/src/com/inmind/generic04/Demo07.java b/s-day02/src/com/inmind/generic04/Demo07.java
new file mode 100644
index 0000000..5d1df77
--- /dev/null
+++ b/s-day02/src/com/inmind/generic04/Demo07.java
@@ -0,0 +1,23 @@
+package com.inmind.generic04;
+
+import java.util.ArrayList;
+
+/*
+java语言是伪泛型，泛型只存在编译时候，到运行时期，泛型就不存在了，会回归为原始类型数据Object
+ */
+public class Demo07 {
+    public static void main(String[] args) {
+        ArrayList<String> list1 = new ArrayList();
+        ArrayList<Integer> list2 = new ArrayList();
+        list1.add("hello1");
+        list1.add("hello2");
+        list2.add(1);
+        list2.add(2);
+        for (String s : list1) {
+            System.out.println(s);
+        }
+        for (Integer i : list2) {
+            System.out.println(i);
+        }
+    }
+}