From 857b9e43b6d96e1589fe75510361d74d6c756fa2 Mon Sep 17 00:00:00 2001
From: xuxin <840198532@qq.com>
Date: Tue, 3 Feb 2026 11:48:49 +0800
Subject: [PATCH] =?UTF-8?q?=E8=BF=9B=E9=98=B6day04-=E9=9B=86=E5=90=88?=
 =?UTF-8?q?=E7=9A=84=E5=B5=8C=E5=A5=97?=
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---
 .../src/com/inmind/map01/MapDemo06.java       | 30 +++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 javaSE-day04/src/com/inmind/map01/MapDemo06.java

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);
+
+    }
+}