diff --git a/s-day01/src/com/inmind/system06/SystemDemo16.java b/s-day01/src/com/inmind/system06/SystemDemo16.java
index 76ba5fa..2d38a77 100644
--- a/s-day01/src/com/inmind/system06/SystemDemo16.java
+++ b/s-day01/src/com/inmind/system06/SystemDemo16.java
@@ -1,4 +1,7 @@
 package com.inmind.system06;
+
+import java.util.Arrays;
+
 /*
 System中的arrayCopy方法
 
@@ -29,6 +32,19 @@ public class SystemDemo16 {
      */
     public static void main(String[] args) {
         //static void arraycopy(Object src, int srcPos, Object dest, int destPos, int length)
+        int[] srcArr = {1,2,3,4,5};
+        int[] destArr = {6,7,8,9,10};
+        /*
+            底层源码：
+             public static native void arraycopy(Object src,  int  srcPos,
+                                        Object dest, int destPos,
+                                        int length);
+            java中JNI：通过java代码调用底层C，C++代码从而操作硬件
+         */
+        System.arraycopy(srcArr,1,destArr,2,3);
+        System.out.println(Arrays.toString(srcArr));
+        System.out.println(Arrays.toString(destArr));
 
+        //其实ArrayList底层就是数组，所以底层也是调用的arraycopy方法
     }
 }