diff --git a/day05/src/com/inmind/array01/Demo11.java b/day05/src/com/inmind/array01/Demo11.java
new file mode 100644
index 0000000..30f0f26
--- /dev/null
+++ b/day05/src/com/inmind/array01/Demo11.java
@@ -0,0 +1,18 @@
+package com.inmind.array01;
+/*
+引用类型作为方法参数
+ */
+public class Demo11 {
+    public static void main(String[] args) {
+        //定义一个数组
+        int[] arr = {10,20};
+        changeValue(arr);//引用数据类型传递的是地址
+        System.out.println(arr[0]);//20
+        System.out.println(arr[1]);//40
+    }
+
+    private static void changeValue(int[] arr) {
+        arr[0] = arr[0] + arr[0];
+        arr[1] = arr[1] + arr[1];
+    }
+}