javasingleexecutor_java–ExecutorServiceSingleThreadExecutor

First question: Is this also true for a SingleThreadExecutor? Does the thread get terminated?

看一下Executors的源代码,比较newCachedThreadPool和newSingleThreadExecutor的实现&＃xff1a;

public static ExecutorService newCachedThreadPool() {

return new ThreadPoolExecutor(0, Integer.MAX_VALUE,

60L, TimeUnit.SECONDS,

new SynchronousQueue());

}

public static ExecutorService newSingleThreadExecutor() {

return new FinalizableDelegatedExecutorService

(new ThreadPoolExecutor(1, 1,

0L, TimeUnit.MILLISECONDS,

new LinkedBlockingQueue()));

}

主要区别(此处感兴趣)是60L,TimeUnit.SECONDS和0L,TimeUnit.MILLISECONDS.

A time value of zero will cause excess threads to terminate immediately after executing tasks.

其中“多余线程”实际上是指“超过核心池大小的线程”.

>使用零核心线程和(有效)无限数量的非核心线程创建缓存线程池;因此,任何线程都可以在保持活动时间之后终止.

>使用1个核心线程和零个非核心线程创建单线程执行程序;因此,在保持活动时间之后没有可以终止的线程&＃xff1a;它的一个核心线程保持活动状态,直到你关闭整个ThreadPoolExecutor.

(感谢&＃64;GPI指出我之前的解释错了).