package array;

import java.util.ArrayList;

import java.util.Random;

public class RandomSelect {

ArrayList<String> group=new ArrayList<>();

void addMember(String member){

if(group.contains(member))

return;

group.add(member);

}

String select(){

String result=null;

if(!group.isEmpty()){

int randomNum=new Random().nextInt(group.size());

result=group.get(randomNum);

}

return result;

}

public static void main(String[] args) {

RandomSelect selector=new RandomSelect();

selector.addMember("Jim");

selector.addMember("bill");

selector.addMember("tom");

selector.addMember("sam");

selector.addMember("peter");

System.out.println("select:"+selector.select());

System.out.println("select:"+selector.select());

System.out.println("select:"+selector.select());

System.out.println("select:"+selector.select());

System.out.println("select:"+selector.select());

}

}