diff --git a/s-day03/src/com/inmind/collections04/Demo13.java b/s-day03/src/com/inmind/collections04/Demo13.java
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+++ b/s-day03/src/com/inmind/collections04/Demo13.java
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+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);
+
+    }
+}