CallableAndFuture

最新推荐文章于 2025-09-08 09:22:18 发布

转载最新推荐文章于 2025-09-08 09:22:18 发布 · 57 阅读

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原文链接：https://my.oschina.net/LucasZhu/blog/1529667

文章标签：

#python

本文通过示例详细介绍了Java中Callable接口和Future接口的使用方法，包括如何创建线程池、提交带返回值的任务并获取结果。

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public class CallableAndFuture {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		ExecutorService threadPool =  Executors.newSingleThreadExecutor();
		Future<String> future =
			threadPool.submit(
				new Callable<String>() {
					public String call() throws Exception {
						Thread.sleep(2000);
						return "hello";
					};
				}
		);
		System.out.println("等待结果");
		try {
			System.out.println("拿到结果：" + future.get());
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		ExecutorService threadPool2 =  Executors.newFixedThreadPool(10);
		CompletionService<Integer> completionService = new ExecutorCompletionService<Integer>(threadPool2);
		for(int i=1;i<=10;i++){
			final int seq = i;
			completionService.submit(new Callable<Integer>() {
				@Override
				public Integer call() throws Exception {
					Thread.sleep(new Random().nextInt(5000));
					return seq;
				}
			});
		}
		for(int i=0;i<10;i++){
			try {
				System.out.println(
						completionService.take().get());
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (ExecutionException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}
	

}

转载于:https://my.oschina.net/LucasZhu/blog/1529667