submit()使用案例
public class Test {
private static final String SUCCESS = "success";
public static void main(String[] args) {
ExecutorService executorService = Executors.newFixedThreadPool(3);
System.out.println("------------------任务开始执行---------------------");
Future<String> future = executorService.submit(new Callable<String>() {
@Override
public String call() throws Exception {
Thread.sleep(5000);
System.out.println("submit方法执行任务完成" + " thread name: " + Thread.currentThread().getName());
return SUCCESS;
}
});
try {
String s = future.get();
if (SUCCESS.equals(s)) {
String name = Thread.currentThread().getName();
System.out.println("经过返回值比较，submit方法执行任务成功 thread name: " + name);
}
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
System.out.println("-------------------main thread end---------------------");
}
}
打印结果：
------------------任务开始执行---------------------
call()调用开始: 1496899867882
submit方法执行任务完成: 1496899872897 thread name: pool-1-thread-1
经过返回值比较，submit方法执行任务成功 thread name: main
-------------------main thread end---------------------
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主线程会一直阻塞，等待线程池中的任务执行完后，在执行后面的语句。