diff --git a/day05/src/com/inmind/array01/Demo03.java b/day05/src/com/inmind/array01/Demo03.java
new file mode 100644
index 0000000..d05fab0
--- /dev/null
+++ b/day05/src/com/inmind/array01/Demo03.java
@@ -0,0 +1,20 @@
+package com.inmind.array01;
+/*
+    数组的异常_角标越界异常
+    ArrayIndexOutOfBoundsException:
+    数组 索引 越界 异常
+
+    注意：数组中长度是固定的，数组的最大索引值，数组长度-1,数组.length - 1就是最大门牌号，
+         0-数组.length - 1的门牌才能正确操作数组，否则ArrayIndexOutOfBoundsException
+ */
+public class Demo03 {
+    public static void main(String[] args) {
+        double[] arr = new double[3];
+        System.out.println(arr);//地址
+        System.out.println(arr[0]);//0.0
+        System.out.println(arr[1]);
+        System.out.println(arr[2]);
+        System.out.println(arr[3]);
+        System.out.println(arr[4]);
+    }
+}