From 9f98cf2657010884d318cf7e29117c4881bb5b18 Mon Sep 17 00:00:00 2001
From: adiao <1819192616@qq.com>
Date: Sun, 5 Nov 2023 19:53:11 +0800
Subject: [PATCH] Updated files

---
 EssOS/技术笔记.md | 49 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)

diff --git a/EssOS/技术笔记.md b/EssOS/技术笔记.md
index 7ed7549..27aef4f 100644
--- a/EssOS/技术笔记.md
+++ b/EssOS/技术笔记.md
@@ -88,3 +88,52 @@ public class JavaCollectionExample1 {
 集合中的元素: []
 ```
 
+实例2：
+
+```java
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.Set;
+import java.util.concurrent.ConcurrentLinkedQueue;
+
+public class JavaCollectionExample2 {
+   public static void main(String[] args) {
+      ConcurrentLinkedQueue<Integer> queue = new ConcurrentLinkedQueue<Integer>();
+      Set<Integer> set = new HashSet<>();
+      // 将指定集合的所有元素添加到调用集合中
+      Collections.addAll(set, 11, 12, 13, 14, 15);
+      System.out.println("集合: " + set);
+      // 返回按正确顺序对元素进行迭代的迭代器
+      Iterator<Integer> iterator = set.iterator();
+      while (iterator.hasNext()) {
+         System.out.println(iterator.next());
+      }
+      set.clear();
+      // 检查集合是否为空
+      boolean isEmpty = set.isEmpty();
+      if (isEmpty) {
+         System.out.println("集合为空");
+      } else {
+         System.out.println("集合不为空");
+      }
+      for (int i = 1; i < 21; i++) {
+         queue.add(i);
+      }
+      System.out.println("集合中的元素: " + queue);
+      for (int i = 1; i < 11; i++) {
+         int j = i * 5;
+         set.add(j);
+      }
+      // 仅保留集合中与指定集合中存在的元素
+      queue.retainAll(set);
+      System.out.println("5的倍数: " + queue);
+   }
+}
+```
+
+输出结果：
+
+```java
+```
+