From b5ff8ffb1ff4e0c6dbd44c36c532c2960860923c Mon Sep 17 00:00:00 2001
From: xuxin <840198532@qq.com>
Date: Wed, 14 Oct 2026 13:39:17 +0800
Subject: [PATCH] =?UTF-8?q?s-day03--HashSet=E7=89=B9=E7=82=B9=E4=BB=A5?=
 =?UTF-8?q?=E5=8F=8A=E9=81=8D=E5=8E=86?=
MIME-Version: 1.0
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---
 .../src/com/inmind/set02/HashSetDemo06.java   | 40 +++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 s-day03/src/com/inmind/set02/HashSetDemo06.java

diff --git a/s-day03/src/com/inmind/set02/HashSetDemo06.java b/s-day03/src/com/inmind/set02/HashSetDemo06.java
new file mode 100644
index 0000000..882357f
--- /dev/null
+++ b/s-day03/src/com/inmind/set02/HashSetDemo06.java
@@ -0,0 +1,40 @@
+package com.inmind.set02;
+
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.Iterator;
+
+/*
+HashSet特点以及遍历
+HashSet接口的特点：
+    1.存取无序（怎么存不一定怎么取）
+    2.没有索引
+    3.不能重复
+
+HashSet底层数据结构是哈希表(数组+双向链表+红黑树)，就是一个HashMap
+ */
+public class HashSetDemo06 {
+    public static void main(String[] args) {
+        HashSet<String> sets = new HashSet<>();
+        sets.add("张飞");
+        sets.add("关羽");
+        sets.add("刘备");
+        sets.add("张飞");
+        System.out.println(sets);
+
+        //set集合的遍历，没有素引的，所以普通for循环不能实现遍历
+        //迭代器遍历
+        Iterator<String> iterator = sets.iterator();
+        while (iterator.hasNext()) {
+            System.out.println(iterator.next());
+        }
+        //增强for循环遍历:语法糖--本质就是迭代器
+        for (String s : sets) {
+            System.out.println(s);
+        }
+        //借用set集合来实现去重，转为数组
+        Object[] array = sets.toArray();
+        System.out.println(Arrays.toString(array));
+
+    }
+}