private final ThreadPoolExecutor executor = new ThreadPoolExecutor(5, 20, 60, TimeUnit.SECONDS, new LinkedBlockingQueue<>());中文解释下
时间: 2023-11-22 09:23:43 浏览: 30
这段代码定义了一个名为executor的私有常量,它是一个ThreadPoolExecutor(线程池执行器)对象。此线程池执行器有以下参数:最小线程数为5,最大线程数为20,空闲线程的存活时间为60秒,使用LinkedBlockingQueue(链表阻塞队列)作为任务队列。这个线程池执行器可以用来执行多个任务。
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private final ThreadPoolExecutor executor = new ThreadPoolExecutor(5, 20, 60, TimeUnit.SECONDS, new LinkedBlockingQueue<>());
This code creates a private final instance variable named "executor" of the class ThreadPoolExecutor.
The ThreadPoolExecutor is a class in Java's concurrency package that provides a thread pool for executing tasks asynchronously.
The constructor for the ThreadPoolExecutor takes several parameters:
- The first parameter (5) represents the core pool size, which is the number of threads that will be created and kept alive even when they are idle.
- The second parameter (20) represents the maximum pool size, which is the maximum number of threads that will be created if there are more tasks than threads in the core pool.
- The third parameter (60) represents the keep-alive time, which is the amount of time that excess idle threads will wait for new tasks before being terminated.
- The fourth parameter (TimeUnit.SECONDS) specifies the time unit for the keep-alive time.
- The fifth parameter (new LinkedBlockingQueue<>() ) specifies the queue used to hold tasks that are waiting to be executed. In this case, a LinkedBlockingQueue is used, which is a thread-safe queue implementation that can grow indefinitely.
Overall, this code creates a thread pool with 5 core threads, a maximum of 20 threads, and a keep-alive time of 60 seconds, and uses a LinkedBlockingQueue to hold tasks that are waiting to be executed.
ThreadPoolExecutor executor = new ThreadPoolExecutor(10, 20, 60L, TimeUnit.SECONDS, new LinkedBlockingQueue<Runnable>());
ThreadPoolExecutor是Java中的一个线程池实现类,它可以用来管理和调度多个线程。在创建ThreadPoolExecutor时,需要指定一些参数,例如核心线程数、最大线程数、线程空闲时间等。其中,核心线程数是指线程池中一直存在的线程数量,最大线程数是指线程池中最多可以存在的线程数量。当线程池中的线程数量超过核心线程数时,新的任务会被放入阻塞队列中等待执行。如果阻塞队列已满,且线程池中的线程数量还没有达到最大线程数,那么会创建新的线程来执行任务。如果线程池中的线程数量已经达到最大线程数,那么新的任务会被拒绝执行。
在这个例子中,创建了一个ThreadPoolExecutor对象,它有10个核心线程,最多可以存在20个线程,线程空闲时间为60秒,任务队列使用的是LinkedBlockingQueue。这个线程池可以用来执行多个任务,当任务数量超过核心线程数时,新的任务会被放入任务队列中等待执行。如果任务队列已满,且线程池中的线程数量还没有达到最大线程数,那么会创建新的线程来执行任务。如果线程池中的线程数量已经达到最大线程数,那么新的任务会被拒绝执行。