创建单个线程，用来操作一个*的队列任务，不会使用额外的线程。如果线程崩溃会重新创建一个，直到任务完成。
代码：
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors; public class Threadd2 { public static void main(String[] args) {
ExecutorService es = Executors.newSingleThreadExecutor();
run command = new run();
es.execute(command);
es.execute(command);
es.shutdown();
} } class run implements Runnable{ @Override
public void run() {
// TODO Auto-generated method stub
try {
Thread.sleep(100);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println(Thread.currentThread().getName());
} }
输出结果：pool-1-thread-1
pool-1-thread-1