java怎么调用线程池调用 ExecutorService

public class Testphore implements Runnable  {
     private int id;
     Testphore(int id){
         this.id=id;
     }
     public void run() {
        try {
            System.out.println(this.id+"html写在这里.....");
        } catch (Exception e) {
            e.printStackTrace();
        }
     }
}

public class TestExecutor {
        public static void main(String[] args)throws Exception{
             ExecutorService     es = Executors.newCachedThreadPool();
            for(int i=1;i<5;i++){
                es.execute(new Testphore(i));
            }
            es.shutdown();

        }

}

shutdown，执行后不再接收新任务，如果里面有任务，就执行完