一步步瞭解執行緒池之按需建立-CachedThreadPool

CachedThreadPool構造方法

public static ExecutorService newCachedThreadPooll() {
    return new ThreadPoolExecutor(0, Integer.MAX_VALUE, 60L, TimeUnit.SECONDS, new SynchronousQueue<Runnable>());
}
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該執行緒池特點：無核心執行緒數，只有非核心執行緒，非核心執行緒數可達到Integer.MAX_VALUE，且非核心執行緒等待時間為60秒，採用SynchronousQueue佇列。

使用案例：

val pool: ExecutorService = Executors.newCachedThreadPool()

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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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