在Runnable类中循环时终止Java Fx应用程序

我上过这门课

public class EXEC implements Runnable{
 private final AtomicBoolean running = new AtomicBoolean(false);

 WebDriver driver;
public EXEC(WebDriver driver) {
    this.driver = driver;
}     
public void stop() {
    running.set(false);
}

@Override
public void run() {
    // TODO Auto-generated method stub
    String pass=SampleController.getMyVariable();
     running.set(true);
     while(running.get()){
    int i=1;
    i++;
    System.out.println(i);
 }
     Platform.exit();
}
}

在UI控制器类 我用如下方法指定了Run and Quit按钮

EXEC mythread=  new EXEC(drivers);

public void run()
{mythread.run();}

public void quit()
{ mythread.stop();}

mythread.run（）

对我有效。但是它没有终止 通过

mythread.stop（）。请帮我怎么弄到它