Alexander Vasin (prieran) vs CountDownLatch - #9
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Суть задания в том, чтобы заставить ждать один поток до тех пор, пока все остальные не сделают что-то там
CountDownLatch создан как раз для этого. Он и использовался
Заодно был синхронизирован доступ к множеству с результатами. Кто его знает, что произойдёт, если два потока одновременно начнут в него что-то добавлять
Глупой ошибкой было запихнуть new DowloadLatch().doWork() в блок synchronized, в результате чего потоки по сути работали по очереди. Не надо так