diff --git a/javaSE-day04/src/com/inmind/map01/MapDemo06.java b/javaSE-day04/src/com/inmind/map01/MapDemo06.java
new file mode 100644
index 0000000..f4840c6
--- /dev/null
+++ b/javaSE-day04/src/com/inmind/map01/MapDemo06.java
@@ -0,0 +1,30 @@
+package com.inmind.map01;
+
+import java.util.*;
+
+/*
+集合的嵌套
+需求：定义一个双列集合展示对应省份，拥有的城市
+江苏省：苏州 ，无锡，常州，南京，扬州
+ */
+public class MapDemo06 {
+    public static void main(String[] args) {
+        //1.定义一个Key为String，Value为Set集合的双列集合
+        Map<String, Set<String>> map = new HashMap<>();
+
+        HashSet<String> sets1 = new HashSet<>();
+        sets1.add("苏州");
+        sets1.add("无锡");
+        sets1.add("常州");
+        sets1.add("南京");
+        map.put("江苏省", sets1);
+        System.out.println(map);
+
+        HashSet<String> sets2 = new HashSet<>();
+        Collections.addAll(sets2,"武汉","孝感","宜昌");
+        map.put("湖北省", sets2);
+
+        System.out.println(map);
+
+    }
+}