Callable、Future和FutureTask使用说明

 1 import java.util.concurrent.Callable;
 2 import java.util.concurrent.ExecutionException;
 3 import java.util.concurrent.ExecutorService;
 4 import java.util.concurrent.Executors;
 5 import java.util.concurrent.Future;
 6  
 7 public class CallableAndFuture1 {
 8  
 9         public static void main(String[] args) {
10               ExecutorService service = Executors.newSingleThreadExecutor();
11  
12               Future<Integer> future = service.submit( new Callable<Integer>() {
13  
14                       @Override
15                       public Integer call() throws Exception {
16                            System. out.println("子线程" + Thread.currentThread().getName() + "在进行计算");
17                            Thread. sleep(3000);
18  
19                             int sum = 0;
20                             for (int i = 0; i < 100; i++) {
21                                   sum += i;
22                            }
23                             return sum;
24                      }
25               });
26  
27               System. out.println("主线程" + Thread.currentThread ().getName() + "在执行任务" );
28  
29                try {
30                      System. out.println("子线程运行结果" + future.get());
31               } catch (InterruptedException e) {
32                      e.printStackTrace();
33               } catch (ExecutionException e) {
34                      e.printStackTrace();
35               }
36  
37               System. out.println("所有任务执行完毕" );
38  
39        }
40 }