Java线程池理解
线程池理解
线程池的构造函数：
- corePoolSize： the number of threads to keep in the pool, even if they are idle, unless {@code allowCoreThreadTimeOut} is set（线程池中活跃的线程数，即使他们是空闲的，没有任务可以执行的，也不会销毁，除非设置 allowCoreThreadTimeOut）
- maximumPoolSize： the maximum number of threads to allow in the pool（线程池中允许的最大线程数量）
- keepAliveTime： when the number of threads is greater than the core, this is the maximum time that excess idle threads will wait for new tasks before terminating.（当线程的数量大于核心线程数的时候，空闲的线程在他们销毁到等待新的任务到来，这段时间的最大值）
- unit： the time unit for the {@code keepAliveTime} argument（keepAliveTime 的时间单位）
- workQueue： the queue to use for holding tasks before they are executed. This queue will hold only the {@code Runnable} tasks submitted by the {@code execute} method.（任务执行之前保存任务的队列，该队列将只保存由{@code execute}方法提交的{@code Runnable}任务）
- threadFactory： the factory to use when the executor creates a new thread（执行程序创建新线程时要使用的工厂）
- handler：the handler to use when execution is blocked because the thread bounds and queue capacities are reached（当执行因达到线程边界和队列容量而阻塞时要使用的处理程序）
