java--字符输入流BufferReader实现点名器

代码如下:

得先在路径下创建txt文件，输入名字

package com;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Random;

public class dianName {
    public static void main(String[] args) throws IOException {
        BufferedReader br=new BufferedReader(new FileReader("test.txt"));
        ArrayList<String> arry=new ArrayList<String>();
        String line;
        while ((line=br.readLine())!=null){
            arry.add(line);

        }
        br.close();
        Random r=new Random();
        int index = r.nextInt(arry.size());
        String name=arry.get(index);
        System.out.println("幸运儿是："+name+"   同志");

    }
}