From 648800a6008826ef14ec350a281bc67c4069e4d5 Mon Sep 17 00:00:00 2001
From: xuxin <840198532@qq.com>
Date: Sun, 2 Aug 2026 11:03:05 +0800
Subject: [PATCH] =?UTF-8?q?s-day02-=E5=93=88=E5=B8=8C=E8=A1=A8=E4=BB=A5?=
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---
 .../src/com/inmind/set02/HashTableDemo09.java | 36 +++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 s-day03/src/com/inmind/set02/HashTableDemo09.java

diff --git a/s-day03/src/com/inmind/set02/HashTableDemo09.java b/s-day03/src/com/inmind/set02/HashTableDemo09.java
new file mode 100644
index 0000000..113dee6
--- /dev/null
+++ b/s-day03/src/com/inmind/set02/HashTableDemo09.java
@@ -0,0 +1,36 @@
+package com.inmind.set02;
+
+import java.util.HashSet;
+
+/*
+    哈希表以及HashSet中去重复的原理
+
+    Set集合底层的数据结构是哈希表
+
+    哈希表:在JDK8之前,就是数组+链表
+    哈希表:在JDK8之后,就是数组+链表+红黑树
+ */
+public class HashTableDemo09 {
+    public static void main(String[] args) {
+        String str1 = "abc";
+        String str2 = new String("abc");
+        String str3 = "通话";
+        String str4 = "重地";
+        //查看他们各自的哈希值
+        System.out.println(str1.hashCode());
+        System.out.println(str2.hashCode());
+        System.out.println(str3.hashCode());
+        System.out.println(str4.hashCode());
+
+        //存入set集合
+        HashSet<String> sets = new HashSet<>();
+        sets.add(str1);
+        sets.add(str2);
+        //更换了通话和重地的添加顺序后，改变了sets集合的内容展示顺序，为什么呢？？哈希表数据结构导致的
+        sets.add(str4);
+        sets.add(str3);
+        System.out.println(sets);
+
+
+    }
+}