From 0ae9f815f161b8333ef9b654d5af8a5568e43ac5 Mon Sep 17 00:00:00 2001
From: xuxin <840198532@qq.com>
Date: Sun, 1 Feb 2026 10:06:14 +0800
Subject: [PATCH] =?UTF-8?q?=E8=BF=9B=E9=98=B6day03-HashSet=E7=89=B9?=
 =?UTF-8?q?=E7=82=B9=E4=BB=A5=E5=8F=8A=E9=81=8D=E5=8E=86?=
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---
 .../src/com/inmind/set02/HashSetDemo07.java   | 35 +++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100644 javaSE-day03/src/com/inmind/set02/HashSetDemo07.java

diff --git a/javaSE-day03/src/com/inmind/set02/HashSetDemo07.java b/javaSE-day03/src/com/inmind/set02/HashSetDemo07.java
new file mode 100644
index 0000000..c362d94
--- /dev/null
+++ b/javaSE-day03/src/com/inmind/set02/HashSetDemo07.java
@@ -0,0 +1,35 @@
+package com.inmind.set02;
+
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.Set;
+
+/*
+    HashSet特点以及遍历
+    HashSet就是Set集合的实现类,它的特点也是
+        1.存取无序(怎么存的不一定怎么取)
+        2.没有索引
+        3.不能重复
+    HashSet的底层实现是哈希表，就是一个HashMap
+ */
+public class HashSetDemo07 {
+    public static void main(String[] args) {
+        //创建一个HashSet集合
+        HashSet<String> sets = new HashSet<>();
+        sets.add("刘备");
+        sets.add("关羽");
+        sets.add("张飞");
+        System.out.println(sets);
+        //Set集合是没有索引的，就无法通过普通for循环遍历，只能迭代器，foreach循环，后期可以使用Stream也可以
+        Iterator<String> iterator = sets.iterator();
+        //迭代器遍历
+        while (iterator.hasNext()) {
+            String next = iterator.next();
+            System.out.println(next);
+        }
+        //语法糖foreach循环，替代迭代器来遍历
+        for (String s : sets) {
+            System.out.println(s);
+        }
+    }
+}