为什么我的打印语句在一段时间循环后没有产生 output？

Question

What's wrong with this version of this code? (I read something about an "incorrect exit condition" but I don't see how that could be?)

import java.util.*;

public class First {

    public static void main(String[] args) {

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

        Scanner scan = new Scanner(System.in);

        while(scan.hasNext()){
              String lineOneVar = scan.next();
              lineOne.add(lineOneVar);
              /*System.out.println(lineOneVar);
              System.out.println(lineOne);
              System.out.println(lineOne.get(0));*/
        }

        System.out.println(lineOne);
        //Does not produce an output.
    }
}

Answer 1

You should use the below concept

if(s1.equals("exit")) {
        break;
}

Please see this solution