java多线程问题，线程不能结束

Question

import java.util.Scanner;

public class MonitorTask implements Runnable {

private boolean flag =true;
private String word=null;

public void stopMe(){
    this.flag=false;
}

public void sendWord(String word){
    this.word=word;
}

@Override
public void run() {
        while (flag) {
            if (word != null && word.contains("alien")) {
                System.out.println(Thread.currentThread().getName() + " found alien in " + word);
            }
            word = null;

        }
        System.out.println(Thread.currentThread().getName() + " stop");
}

}
class Main1{
public static void main(String[] args) throws InterruptedException {
Scanner scan=new Scanner(System.in);
MonitorTask monitorTask = new MonitorTask();
Thread t=new Thread(monitorTask);
t.start();
while(true){
String word=scan.next();
if(word.equals("stop")){
monitorTask.stopMe();
break;
}
monitorTask.sendWord(word);
}

}

}

Answer 1

interrupt函数不就可以吗