Java 如何同时启动两个线程

要完全同时（至少尽可能好）启动线程，可以使用CyclicBarrier：

// We want to start just 2 threads at the same time, but let's control that // timing from the main thread. That's why we have 3 "parties" instead of 2.final CyclicBarrier gate = new CyclicBarrier(3);Thread t1 = new Thread(){    public void run(){        gate.await();        //do stuff        }};Thread t2 = new Thread(){    public void run(){        gate.await();        //do stuff        }};t1.start();t2.start();// At this point, t1 and t2 are blocking on the gate. // Since we gave "3" as the argument, gate is not opened yet.// Now if we block on the gate from the main thread, it will open// and all threads will start to do stuff!gate.await();System.out.println("all threads started");

这不必是

CyclicBarrier

CountDownLatch

这仍然无法确保它们已正确启动

在其他平台上，确切地说启动线程可能是非常有效的要求。