java - 运行的线程数

Question

我对下面的代码很好奇。假设我有一个运行下面代码的 main() 方法。使用以下代码可以运行的最大线程数是多少？

ExecutorService ex= Executors.newFixedThreadPool(3);
 for(int i = 1; i <= 5; i++) {
            RunnableTask task = new RunnableTask(i, 3);
            ex.submit(task);
        } 

答案会是 4 吗？由于我有一个主线程和另外 3 个线程，因为 ExecutorService 只允许最多运行 3 个线程？

Answer 1

据官方documentation .

If additional tasks are submitted when all threads are active, they will wait in the queue until a thread is available. If any thread terminates due to a failure during execution prior to shutdown, a new one will take its place if needed to execute subsequent tasks. The threads in the pool will exist until it is explicitly shutdown.