diff --git a/s-day04/src/com/inmind/map01/MapDemo05.java b/s-day04/src/com/inmind/map01/MapDemo05.java
new file mode 100644
index 0000000..35397be
--- /dev/null
+++ b/s-day04/src/com/inmind/map01/MapDemo05.java
@@ -0,0 +1,21 @@
+package com.inmind.map01;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+/*
+6.LinkedHashMap的特点
+hash:哈希表，它的作用去重，通过hashCode和equals
+link：链表，保证有序
+
+LinkedHashMap：存取有序，没有索引，不能重复的，一个双列集合
+ */
+public class MapDemo05 {
+    public static void main(String[] args) {
+        LinkedHashMap<Integer, String> map = new LinkedHashMap<>();
+        map.put(2, "关羽");
+        map.put(3, "张飞");
+        map.put(1, "刘备");
+        System.out.println(map);
+    }
+}