}//第四个也是真正的初始化构造函数publicThreadPoolExecutor(intcorePoolSize,intmaximumPoolSize,longkeepAliveTime, TimeUnit unit, BlockingQueue<Runnable>workQueue, ThreadFactory threadFactory, RejectedExecutionHandler handler) {if(corePoolSize < 0 ||maximumPoolSize<= 0 ||maximumPoolSize< corePoolSize ||...
上文提到可以通过显式的ThreadPoolExecutor构造函数来构造特定形式的线程池,ThreadPoolExecutor是java.util.concurrent包以内部线程池的形式对外提供线程池管理、线程调度等服务,此处我们来了解一下ThreadPoolExecutor (1)一般使用方式 ExecutorService exec =newThreadPoolExecutor(8,8,0L, TimeUnit.MILLISECONDS,newLinkedBlo...
import java.util.concurrent.Executors; import java.util.concurrent.ThreadPoolExecutor; import java.util.concurrent.TimeUnit; public class ThreadPoolExecutorExample { public static void main(String[] args) { // 创建线程池 ThreadPoolExecutor executor = new ThreadPoolExecutor( 2, // 核心线程数 4, /...
java.util.concurrent.ThreadPoolExecutor#prestartAllCoreThreads 则直接进入步骤(2)。 (2)当向线程池提交任务时,如果当前线程池中工作线程数大于corePoolSize,但小于maximumPoolSize,则仅当任务工作队列workQueue满时,才会创建一个新线程来执行该任务。 (3)corePoolSize和maximumPoolSize的值不仅能在构造函数指定,而且...
而Executors工厂类一共可以创建四种类型的线程池,通过Executors.newXXX即可创建。下面就分别都介绍一下。 1. FixedThreadPool 代码语言:javascript 代码运行次数:0 运行 AI代码解释 publicstaticExecutorServicenewFixedThreadPool(int nThreads){returnnewThreadPoolExecutor(nThreads,nThreads,0L,TimeUnit.MILLISECONDS,newLinke...
深入学习java源码之Executors.newFixedThreadPool()与Executors.newCachedThreadPool() Executor框架是指java5中引入的一系列并发库中与executor相关的一些功能类,其中包括线程池,Executor,Executors,ExecutorService,CompletionService,Future,Callable等。他们的关系为: ...
public static ExecutorService newCachedThreadPool() { return new ThreadPoolExecutor(0, Integer.MAX_VALUE, 60L, TimeUnit.SECONDS, new SynchronousQueue()); } 创建一个可缓存线程的线程池,默认缓存60s,使用SynchronousQueue作为阻塞队列(没有数据缓存空间的阻塞队列,每一个put操作必须等待一个take操作,若任务提交...
"demo-pool-%d").build(); private static ExecutorService pool = new ThreadPoolExecutor(5, ...
ExecutorCompletionService 执行程序 执行程序 构造函数 属性 方法 Callable DefaultThreadFactory NewCachedThreadPool NewFixedThreadPool NewScheduledThreadPool NewSingleThreadExecutor NewSingleThreadScheduledExecutor NewWorkStealingPool PrivilegedCallable PrivilegedCallableUsingCurrentClassLoader ...
If corePoolSize or more threads are running, the Executor always prefers queuing a request rather than adding a new thread. If a request cannot be queued, a new thread is created unless this would exceed maximumPoolSize, in which case, the task will be rejected. There are...