s-day02-Collections中的addAll和shuffle方法
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package com.inmind.collections04;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.HashSet;
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/*
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Collections的常用方法
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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。
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static void shuffle(List<?> list) 使用默认的随机源随机排列指定的列表。
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*/
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public class Demo13 {
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public static void main(String[] args) {
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//创建List集合
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ArrayList<String> lists = new ArrayList<String>();
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//创建Set集合
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HashSet<Integer> sets = new HashSet<Integer>();
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//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。
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Collections.addAll(lists, "张三", "张三1", "张三2", "张三3", "张三4", "张三5");
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System.out.println(lists);
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Collections.addAll(sets, 1, 2, 3, 4, 5, 6,6,6,6);
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System.out.println(sets);
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Collections.shuffle(lists);
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System.out.println(lists);
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}
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}
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