diff --git a/day05/src/com/inmind/array01/Demo01.java b/day05/src/com/inmind/array01/Demo01.java
index cb226a5..b0a7a72 100644
--- a/day05/src/com/inmind/array01/Demo01.java
+++ b/day05/src/com/inmind/array01/Demo01.java
@@ -37,5 +37,18 @@ public class Demo01 {
 
         String[] arr4 = {"1","2","3"};
 
+        //获取arr1的长度
+        System.out.println(arr1.length);//3
+        //获取arr1第一个空间的值(取值)
+        /*int value = arr1[0];
+        System.out.println(value);*/
+        System.out.println(arr1[0]);
+        //将100设置到arr1的第一个空间（赋值）
+        arr1[0] = 100;
+        //获取arr1第一个空间的值（取值）
+        System.out.println(arr1[0]);
+
+
+
     }
 }