Given:

class Worker extends Thread {

CyclicBarrier cb;

public Worker(CyclicBarrier cb) { this.cb = cb; }

public void run () {

try {

cb.await();

System.out.println("Worker…");

} catch (Exception ex) { }

}

}

class Master implements Runnable { //line n1

public void run () {

System.out.println("Master…");

}

}

and the code fragment:

Master master = new Master();

//line n2

Worker worker = new Worker(cb);

worker.start();

run methods of both the Worker and Master classes are executed.

You have been asked to ensure that the

Which modification meets the requirement?

line n2, insert CyclicBarrier cb = new CyclicBarrier(2, master);