线程池如何在Java项目中使用

package test; import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; public class ThreadPoolExecutorTest {  public static void main(String[] args) {  ExecutorService cachedThreadPool = Executors.newCachedThreadPool();  for (int i = 0; i < 10; i++) {   final int index = i;   try {   Thread.sleep(index * 1000);   } catch (InterruptedException e) {   e.printStackTrace();   }   cachedThreadPool.execute(new Runnable() {   public void run() {    System.out.println(index);   }   });  }  } }