ThreadPoolExecutor 构造方法 ThreadPoolExecutor 共有四个构造方法： ThreadPoolExecutor(int, int, long, TimeUnit, BlockingQueueRunnable) ThreadPoolExecutor(int, int, long, TimeUnit, BlockingQueueRunnable, ThreadFactory) ThreadPoolExecutor(int, int, long, TimeUnit, BlockingQueueRunnable, RejectedExecutionHandler) ThreadPoolExecutor(int, int, long, TimeUnit, BlockingQueueRunnable, ThreadFactory, RejectedExecutionHandler) 以最多参数的构造方法为例进行分析： public ThreadPoolExecutor(int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit, BlockingQueueRunnable workQueue, ThreadFactory threadFactory, RejectedExecutionHandler handler) { // 核心线程池不能小于0 if (corePoolSize 0 // 最大池大小不能小于等于0 maximumPoolSize = 0 // 最大池大小不能小于核心池大小 maximumPoolSize corePoolSize // 存活时间不能小于0 keepAliveTime 0) // 否则将会抛出 IllegalArgumentException非法参数异常 throw new IllegalArgumentException(); //工作队列、线程工厂、拒绝执行的处理策略都不能为空，否则将会排除NPE空指针异常 if (workQueue == null threadFactory == null handler == null) throw new NullPointerException(); this.acc = System.getSecurityManager() == null ? null : AccessController.getContext(); this.corePoolSize = corePoolSize; this.maximumPoolSize = maximumPoolSize; this.workQueue = workQueue; this.keepAliveTime = unit.toNanos(keepAliveTime); this.threadFactory = threadFactory; this.handler = handler; }