From 9fdfe005be50804f82a6b1b19df9b4c2863461a0 Mon Sep 17 00:00:00 2001
From: xuxin <840198532@qq.com>
Date: Sat, 31 Jan 2026 09:53:42 +0800
Subject: [PATCH] =?UTF-8?q?=E8=BF=9B=E9=98=B6day02-=E8=BF=AD=E4=BB=A3?=
 =?UTF-8?q?=E5=99=A8=E9=81=8D=E5=8E=86=E9=9B=86=E5=90=88=E7=9A=84=E6=B5=81?=
 =?UTF-8?q?=E7=A8=8B=E4=B8=8E=E5=AE=9E=E7=8E=B0?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
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---
 .../inmind/collection01/CollectionDemo01.java |  2 +
 .../com/inmind/iterator02/IteratorDemo02.java | 64 +++++++++++++++++++
 2 files changed, 66 insertions(+)
 create mode 100644 javaSE-day02/src/com/inmind/iterator02/IteratorDemo02.java

diff --git a/javaSE-day02/src/com/inmind/collection01/CollectionDemo01.java b/javaSE-day02/src/com/inmind/collection01/CollectionDemo01.java
index bbc3e46..f93de05 100644
--- a/javaSE-day02/src/com/inmind/collection01/CollectionDemo01.java
+++ b/javaSE-day02/src/com/inmind/collection01/CollectionDemo01.java
@@ -54,5 +54,7 @@ public class CollectionDemo01 {
         System.out.println(strList);
         System.out.println(strList.isEmpty());//true
 
+        //--------------------------之前已经学过的集合的遍历----------------------
+
     }
 }
diff --git a/javaSE-day02/src/com/inmind/iterator02/IteratorDemo02.java b/javaSE-day02/src/com/inmind/iterator02/IteratorDemo02.java
new file mode 100644
index 0000000..d5651b9
--- /dev/null
+++ b/javaSE-day02/src/com/inmind/iterator02/IteratorDemo02.java
@@ -0,0 +1,64 @@
+package com.inmind.iterator02;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Iterator;
+
+/*
+    4.迭代器遍历的流程与实现
+
+    1.为什么要学习迭代器??
+     因为单列集合有一部分没有索引,之前的普通for循环不满足遍历操作,所以我们要学习一个通用性的遍历方式,迭代器
+
+    2.如何获取迭代器??
+    Iterator<E> iterator() 返回此集合中元素的迭代器。
+
+    3.迭代器如何使用?
+    boolean hasNext() 如果迭代具有更多元素，则返回 true 。
+    E next() 返回迭代中的下一个元素。
+    使用步骤:
+        1.判断是否有下一条数据
+        2.如果有就获取下一条数据,如果没有就停止
+
+ */
+public class IteratorDemo02 {
+    public static void main(String[] args) {
+        //定义出一个保存字符串的单列集合
+        Collection<String> lists = new ArrayList<>();//父接口引用指向子类对象，多态
+
+        lists.add("刘备");
+        lists.add("关羽");
+        lists.add("张飞");
+        lists.add("张飞");
+        lists.add("张飞");
+        lists.add("张飞");
+
+        //由于当前单列集合没有索引api,只能通过通用性更强的迭代器来遍历
+        Iterator<String> iterator = lists.iterator();
+        /*
+        使用步骤:
+        1.判断是否有下一条数据
+        2.如果有就获取下一条数据,如果没有就停止
+         */
+
+        /*System.out.println(iterator.hasNext());//true
+        System.out.println(iterator.next());//刘备
+
+        System.out.println(iterator.hasNext());//true
+        System.out.println(iterator.next());//关羽
+
+        System.out.println(iterator.hasNext());//true
+        System.out.println(iterator.next());//张飞
+
+        System.out.println(iterator.hasNext());//false
+        System.out.println(iterator.next());//注意：如果迭代器返回没有下一个元素了，还继续获取，则会报异常java.util.NoSuchElementException
+*/
+        //使用while循环来优化迭代器遍历
+        while (iterator.hasNext()) {
+            String next = iterator.next();
+            System.out.println(next);
+        }
+
+        System.out.println("程序结束");
+    }
+}