callable+线程池

package Thread;
import java.util.*;
import java.util.concurrent.*;

public class Callable_线程池 {

	public static void main(String[] args) throws InterruptedException, ExecutionException {
		// TODO Auto-generated method stub
		// List<FutureTask<Integer>> futureTasks=new ArrayList<>();
		ExecutorService executorService = Executors.newFixedThreadPool(10);
		// long start=System.currentTimeMillis();
		Callable<Integer> callable = new Callable<Integer>() {
			@Override
			public Integer call() throws Exception {
				// TODO Auto-generated method stub
				Integer res = new Random().nextInt(100);
				return res;
			}
		};
		// 异步提交
		//第一种办法用futureTask包装返回值
		//https://blog.csdn.net/mack415858775/article/details/51507660
		for (int i = 0; i < 10; i++) {
			FutureTask<Integer> futureTask = new FutureTask<>(callable);
			// futureTasks.add(futureTask);
			executorService.submit(futureTask);
			int res=(int) futureTask.get();
			System.out.print(res+"  ");
		}
		System.out.println("");
		//另一种方法(线程池返回future来获取返回值)
		//https://blog.csdn.net/qq_25806863/article/details/71214033
		for(int i=0;i<10;i++){
			Future future=executorService.submit(callable);
			System.out.print(future.get()+"  ");
		}
		
		// int count = 0;
		// for (FutureTask<Integer> futureTask : futureTasks) {
		// // futureTask.get() 得到我们想要的结果
		// // 该方法有一个重载get(long timeout, TimeUnit unit) 第一个参数为最大等待时间，第二个为时间的单位
		// count += futureTask.get();
		// }
		// long end = System.currentTimeMillis();
		// System.out.println("线程池的任务全部完成:结果为:" + count + "，main线程关闭，进行线程的清理");
		// System.out.println("使用时间：" + (end - start) + "ms");

		executorService.shutdown();

	}
}