Java Scheduler ScheduledExecutorService ScheduledThreadPoolExecutor Example（ScheduledThreadPoolEx...

<span class="hljs-keyword">import</span> java.util.Date; <span class="hljs-keyword">import</span> java.util.concurrent.Executors; <span class="hljs-keyword">import</span> java.util.concurrent.ScheduledExecutorService; <span class="hljs-keyword">import</span> java.util.concurrent.TimeUnit;

<span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">ScheduledThreadPool</span> </span>{

1<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title">main</span><span class="hljs-params">(String[] args)</span> <span class="hljs-keyword">throws</span> InterruptedException </span>{
2	ScheduledExecutorService scheduledThreadPool = Executors.newScheduledThreadPool(<span class="hljs-number">5</span>);
3	
4	
5	<span class="hljs-comment">//schedule to run after sometime</span>
6	System.out.println(<span class="hljs-string">"Current Time = "</span>+<span class="hljs-keyword">new</span> Date());
7	<span class="hljs-keyword">for</span>(<span class="hljs-keyword">int</span> i=<span class="hljs-number">0</span>; i&lt;<span class="hljs-number">3</span>; i++){
8		Thread.sleep(<span class="hljs-number">1000</span>);
9		WorkerThread worker = <span class="hljs-keyword">new</span> WorkerThread(<span class="hljs-string">"do heavy processing"</span>);
10		scheduledThreadPool.schedule(worker, <span class="hljs-number">10</span>, TimeUnit.SECONDS);
11	}
12	
13	<span class="hljs-comment">//add some delay to let some threads spawn by scheduler</span>
14	Thread.sleep(<span class="hljs-number">30000</span>);
15	
16	scheduledThreadPool.shutdown();
17	<span class="hljs-keyword">while</span>(!scheduledThreadPool.isTerminated()){
18		<span class="hljs-comment">//wait for all tasks to finish</span>
19	}
20	System.out.println(<span class="hljs-string">"Finished all threads"</span>);
21}

} </code></pre>