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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);}從源碼來看，這幾個方法本質(zhì)上調(diào)用的都是ScheduledThreadPoolExecutor類的構(gòu)造方法，ScheduledThreadPoolExecutor中存在的構(gòu)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);}而從代碼結(jié)構(gòu)上看，ScheduledThreadPoolExecutor類繼承自ThreadPoolExecutor類，本質(zhì)上還是調(diào)用ThreadPoolExecutor類的構(gòu)造方法，只不過此時傳遞的隊列為DelayedWorkQueue 。我們可以直接調(diào)用ScheduledThreadPoolExecutor類的構(gòu)造方法來創(chuàng)建線程池，例如以如下形式創(chuàng)建線程池。
new ScheduledThreadPoolExecutor(3)

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創(chuàng)建線程池的三種方法 自定義線程池拒絕策略( 三 )

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