FutrueTaskTest1.java

package four;

import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;

public class FutrueTaskTest1 {
	
	public static void main(String[] args) {
		ExecutorService executor = Executors.newCachedThreadPool();
		Task task = new Task();
		Future<Integer> result = executor.submit(task);
		executor.shutdown();

//		try {
//			Thread.sleep(1000);
//		} catch (InterruptedException e1) {
//			e1.printStackTrace();
//		}

		System.out.println("主线程在执行任务 1s结束");

		try {
			result.cancel(true);
			System.out.println("task运行结果" + result.get());
		} catch (InterruptedException e) {
			e.printStackTrace();
		} catch (ExecutionException e) {
			e.printStackTrace();
		}

		System.out.println("所有任务执行完毕");
	}

}

class Task implements Callable<Integer> {
	@Override
	public Integer call() throws Exception {
		System.out.println("子线程在进行计算");
		Thread.sleep(3000);
		int sum = 0;
		for (int i = 0; i < 100; i++)
			sum += i;
		return sum;
	}
}