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0284885 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 | package Case_demo2;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Random;
public class Test2 {
public static void main(String[] args) {
/*
班级里有N个学生
要求：
70%的概率随机到男生
30%的概率随机到女生
"范闲", "范建", "范统", "杜子腾", "朱合泛", "侯笼藤", "朱益群", "朱穆朗玛峰"
"杜琦燕", "袁明媛", "李猜", "田密密"
*/
//1、创建集合
ArrayList<Integer> list = new ArrayList<>();
//2、添加数据
Collections.addAll(list, 1, 1, 1, 1, 1, 1, 1);
Collections.addAll(list, 0, 0, 0);
//3、打乱集合中的数据
Collections.shuffle(list);
//4、从list集合中随机抽取0或者1
Random r = new Random();
int index = r.nextInt(list.size());
int number = list.get(index);
System.out.println(number);
//5、创建两个集合分别存储男生和女生的名字
ArrayList<String> boyList = new ArrayList<>();
ArrayList<String> girlList = new ArrayList<>();
Collections.addAll(boyList, "范闲", "范建",
"范统", "杜子腾", "朱合泛", "侯笼藤", "朱益群", "朱穆朗玛峰");
Collections.addAll(girlList, "杜琦燕", "袁明媛", "李猜", "田密密");
//6、判断此时是从boyList里面抽取还是从girlList里面抽取
if (number == 1) {
//boyList
int boyIndex = r.nextInt(boyList.size());
String name = boyList.get(boyIndex);
System.out.println(name);
} else {
//girlList
int girlIndex = r.nextInt(girlList.size());
String name = girlList.get(girlIndex);
System.out.println(name);
}
}
}
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