创建线程池的三种方法自定义线程池拒绝策略( 三 )

public static ScheduledExecutorService newSingleThreadScheduledExecutor() {return new DelegatedScheduledExecutorService(new ScheduledThreadPoolExecutor(1));}public static ScheduledExecutorService newSingleThreadScheduledExecutor(ThreadFactory threadFactory) {return new DelegatedScheduledExecutorService(new ScheduledThreadPoolExecutor(1, threadFactory));}public static ScheduledExecutorService newScheduledThreadPool(int corePoolSize) {return new ScheduledThreadPoolExecutor(corePoolSize);}public static ScheduledExecutorService newScheduledThreadPool(int corePoolSize, ThreadFactory threadFactory) {return new ScheduledThreadPoolExecutor(corePoolSize, threadFactory);}从源码来看，这几个方法本质上调用的都是ScheduledThreadPoolExecutor类的构造方法，ScheduledThreadPoolExecutor中存在的构造方法如下所示。
public ScheduledThreadPoolExecutor(int corePoolSize) {super(corePoolSize, Integer.MAX_VALUE, 0, NANOSECONDS,new DelayedWorkQueue());}public ScheduledThreadPoolExecutor(int corePoolSize, ThreadFactory threadFactory) {super(corePoolSize, Integer.MAX_VALUE, 0, NANOSECONDS,new DelayedWorkQueue(), threadFactory);}public ScheduledThreadPoolExecutor(int corePoolSize, RejectedExecutionHandler handler) {super(corePoolSize, Integer.MAX_VALUE, 0, NANOSECONDS,new DelayedWorkQueue(), handler);}public ScheduledThreadPoolExecutor(int corePoolSize,ThreadFactory threadFactory, RejectedExecutionHandler handler) {super(corePoolSize, Integer.MAX_VALUE, 0, NANOSECONDS,new DelayedWorkQueue(), threadFactory, handler);}而从代码结构上看，ScheduledThreadPoolExecutor类继承自ThreadPoolExecutor类，本质上还是调用ThreadPoolExecutor类的构造方法，只不过此时传递的队列为DelayedWorkQueue 。我们可以直接调用ScheduledThreadPoolExecutor类的构造方法来创建线程池，例如以如下形式创建线程池。
new ScheduledThreadPoolExecutor(3)

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创建线程池的三种方法 自定义线程池拒绝策略( 三 )

创建线程池的三种方法自定义线程池拒绝策略( 三 )