awaitTermination() shutdown()

newFixedThreadPool

创建一个固定大小的线程池。

shutdown()：用于关闭启动线程，如果不调用该语句，jvm不会关闭。

awaitTermination()：用于等待子线程结束，再继续执行下面的代码。该例中我设置一直等着子线程结束。

Java代码

public class Test {
public static void main(String[] args) throws IOException, InterruptedException {
ExecutorService service = Executors.newFixedThreadPool(2);
for (int i = 0; i < 4; i++) {
Runnable run = new Runnable() {
@Override
public void run() {
System.out.println("thread start");
}
};
service.execute(run);
}
service.shutdown();
service.awaitTermination(Long.MAX_VALUE, TimeUnit.DAYS);
System.out.println("all thread complete");
}
}

public class Test {

 public static void main(String[] args) throws IOException, InterruptedException {
  ExecutorService service = Executors.newFixedThreadPool(2);
  for (int i = 0; i < 4; i++) {
   Runnable run = new Runnable() {
    @Override
    public void run() {
     System.out.println("thread start");
    }
   };
   service.execute(run);
  }
  service.shutdown();
  service.awaitTermination(Long.MAX_VALUE, TimeUnit.DAYS);
  System.out.println("all thread complete");
 }
}

输出：

thread start
thread start
thread start
thread start
all thread complete