Java 异步编程——常用线程池 ThreadPoolExecutor

最新推荐文章于 2025-04-25 09:32:31 发布

原创

最新推荐文章于 2025-04-25 09:32:31 发布 · 1.1k 阅读

27 ·

CC 4.0 BY-SA版权

文章标签：

#java #java异步编程 #Executor #线程池核心参数 #线程池处理流程 #阻塞队列 #拒绝策略

文章目录

ThreadPoolExecutor
Future 接口

ThreadPoolExecutor

java.uitl.concurrent.ThreadPoolExecutor 类是线程池中最核心的一个类。

线程池底层示例图：

ThreadPoolExecutor 的构造方法：

private volatile int corePoolSize;
private volatile int maximumPoolSize;
private volatile long keepAliveTime;
private volatile boolean allowCoreThreadTimeOut;
private volatile int maximumPoolSize;
private final BlockingQueue<Runnable> workQueue;
private volatile RejectedExecutionHandler handler;
private volatile ThreadFactory threadFactory;

private static final RejectedExecutionHandler defaultHandler =new AbortPolicy();

public ThreadPoolExecutor(int corePoolSize,
                              int maximumPoolSize,
                              long keepAliveTime,
                              TimeUnit unit,
                              BlockingQueue<Runnable> workQueue,
                              ThreadFactory threadFactory,
                              RejectedExecutionHandler handler) {
   
   
        if (corePoolSize < 0 ||
            maximumPoolSize <= 0 ||
            maximumPoolSize < corePoolSize ||
            keepAliveTime < 0)
            throw new IllegalArgumentException();
        if (workQueue == null || threadFactory == null || handler == null)
            throw new NullPointerException(