首先我想做的是：在主線程執行期間，我想暫停主線程并啟動兩個并行線程。一旦這兩個并行線程終止，我想再次從主線程開始。我嘗試過的：    ...    ...    main thread is executing    ...    ...CyclicBarrier barrier = new CyclicBarrier(2);Thread child1 = new Thread(new ThreadBuilderTask(barrier,0));Thread child2 = new Thread(new ThreadBuilderTask(barrier,1));child1.start();child2.start(); /* Now i'm expecting that child1 and child2 are running in parallel calling their fooFunction */child1.join();child2.join(); /*Now i'm expecting that main thread will wait for child1and also for child2 (that are running in parallel).*/... main thread starts again after both child1 and child2 finished (reached the await of the barrier) ... (break point set here, never reached)...線程生成器自定義類public class ThreadBuilderTask implements Runnable{    private CyclicBarrier barrier;    private int index;    ...setters and getters..    @Override    public void run() {        fooFunction(this.getIndex());        try {            this.getBarrier().await();        } catch (InterruptedException | BrokenBarrierException e) {            return;        }    }    public ThreadBuilderTask(CyclicBarrier barrier,int index){      this.barrier = barrier;      this.index = index;    }    public fooFunction(int index){        //Something taking some seconds to execute    }目前尚不清楚這里發生了什么，但它肯定不起作用。一旦我調用 join 一切都會停止并且主線程永遠不會重新啟動。（我在連接后放置了一個斷點，以查看主線程何時重新啟動）。也許這些概念有些混亂，而且我不確定是否需要同時使用屏障和連接，或者僅使用其中一種技術。