java-随机点名器(Random )

随机点名器案例

package com.jredu.oop.ch01;

import java.util.ArrayList;

import java.util.List;

import java.util.Random;

import java.util.Scanner;

public class RandomTest {

List list=new ArrayList<>();//存储数据

Scanner in=new Scanner(System.in);

public void insertStu(){

while(true){

System.out.print("请输入学生姓名：");

list.add(in.next());//向list中添加姓名

System.out.print("是否继续");

if(!"y".equals(in.next())){

break;

}

}

}

public void random(){

Random rd=new Random();

while(true){

int r=rd.nextInt(list.size());

System.out.println("被选中的学生是"+list.get(r));

System.out.print("是否继续");

if(!"y".equals(in.next())){

break;

}

}

System.out.println("使用完毕");

}

public static void main(String[] args) {

// TODO Auto-generated method stub

RandomTest test=new RandomTest();

test.insertStu();

test.random();

}

}