多线程编程入门(11):Callable和Future

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1 使用Demo

package cn.itcast.heima2;import java.util.Random;import java.util.concurrent.Callable;import java.util.concurrent.CompletionService;import java.util.concurrent.ExecutorCompletionService;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;import java.util.concurrent.Future;import java.util.concurrent.TimeUnit;public class CallableAndFuture {    public static void main(String[] args) throws Exception {ExecutorService threadPool = Executors.newSingleThreadExecutor();Future<Integer> result = threadPool.submit(new Callable<Integer>() {@Overridepublic Integer call() throws Exception {Thread.sleep(2000);return 1 + 2;}});System.out.println("等待结果");//aynchronized programming System.out.println("拿到结果:"+result.get());//System.out.println("拿到结果:"+result.get(1, TimeUnit.SECONDS));//TimeOutExceptionCompletionService<Integer> completionService = new ExecutorCompletionService<Integer>(Executors.newFixedThreadPool(10));//提交一批任务for (int i = 0; i < 10; i++) {final int seq = i;completionService.submit(new Callable<Integer>() {@Overridepublic Integer call() throws Exception {Thread.sleep(new Random().nextInt(5000));return seq;}});}for (int i = 0; i < 10; i++) {Future<Integer> future = completionService.take();System.out.println("completionService拿到结果:" + future.get());}}}

2 参考链接

https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/Callable.html

https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/Future.html

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