diff --git a/day05/src/com/inmind/array01/Demo03.java b/day05/src/com/inmind/array01/Demo03.java
index 2b98df2..6b576ec 100644
--- a/day05/src/com/inmind/array01/Demo03.java
+++ b/day05/src/com/inmind/array01/Demo03.java
@@ -21,5 +21,8 @@ public class Demo03 {
         System.out.println(arr[0]);//0
         System.out.println(arr[1]);//100
 
+        double[] arr2 = {1.0,2.0};
+        System.out.println(arr2);//[D@3b07d329
+        System.out.println(arr2[1]);//2.0
     }
 }
diff --git a/day05/src/com/inmind/array01/Demo04.java b/day05/src/com/inmind/array01/Demo04.java
new file mode 100644
index 0000000..b8ae0fa
--- /dev/null
+++ b/day05/src/com/inmind/array01/Demo04.java
@@ -0,0 +1,14 @@
+package com.inmind.array01;
+/*
+.数组的内存原理_两个变量操作同一数组的内存图解
+ */
+public class Demo04 {
+    public static void main(String[] args) {
+        //定义整数数组
+        int[] arr1 = {1, 2, 3};//变量arr1是一个整数数组
+        System.out.println(arr1[1]);//2
+        int[] arr2 = arr1;
+        arr2[1] = 100;
+        System.out.println(arr1[1]);//100
+    }
+}