From 3cb9b35ade8a0658b1e7d697e1af3dffd2b5a10f Mon Sep 17 00:00:00 2001
From: xuxin <840198532@qq.com>
Date: Sun, 2 Aug 2026 14:04:07 +0800
Subject: [PATCH] =?UTF-8?q?s-day02-Collections=E4=B8=AD=E7=9A=84addAll?=
 =?UTF-8?q?=E5=92=8Cshuffle=E6=96=B9=E6=B3=95?=
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---
 .../src/com/inmind/collections04/Demo13.java  | 30 +++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 s-day03/src/com/inmind/collections04/Demo13.java

diff --git a/s-day03/src/com/inmind/collections04/Demo13.java b/s-day03/src/com/inmind/collections04/Demo13.java
new file mode 100644
index 0000000..25cef45
--- /dev/null
+++ b/s-day03/src/com/inmind/collections04/Demo13.java
@@ -0,0 +1,30 @@
+package com.inmind.collections04;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashSet;
+
+/*
+Collections的常用方法
+static <T> boolean addAll(Collection<? super T> c, T... elements) 将所有指定的元素添加到指定的集合。
+
+static void shuffle(List<?> list) 使用默认的随机源随机排列指定的列表。
+ */
+public class Demo13 {
+    public static void main(String[] args) {
+        //创建List集合
+        ArrayList<String> lists = new ArrayList<String>();
+        //创建Set集合
+        HashSet<Integer> sets = new HashSet<Integer>();
+        //static <T> boolean addAll(Collection<? super T> c, T... elements) 将所有指定的元素添加到指定的集合。
+        Collections.addAll(lists, "张三", "张三1", "张三2", "张三3", "张三4", "张三5");
+        System.out.println(lists);
+
+        Collections.addAll(sets, 1, 2, 3, 4, 5, 6,6,6,6);
+        System.out.println(sets);
+
+        Collections.shuffle(lists);
+        System.out.println(lists);
+
+    }
+}