一步步瞭解執行緒池之可重用固定執行緒數-FixedThreadPool

FixedThreadPool構造方法

public static ExecutorService newFixedThreadPool(int nThreads) {
    return new ThreadPoolExecutor(nThreads, nThreads, 0L, TimeUnit.MILLISECONDS, new LinkedBlockingQueue<Runnable>());
}
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該執行緒池特點：int引數即為核心執行緒數，只有核心執行緒，無非核心執行緒，阻塞佇列無界（可達系統能承受的最大值）。

使用案例：

val pool: ExecutorService = Executors.newFixedThreadPool(5)

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txt.click {
    for (i in 0 until 30) {
        val runnable = Runnable {
            try {
                Thread.sleep(2000)
                log("當前執行緒是：", Thread.currentThread.name)
            }catch(e: Exception) {
                e.printStackTrace()
            }
        }
        pool.execute(runnable)
    }
}
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