通过代码，解释ExecutorService基本用法

package test1;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;



/**
 * 通过以下代码可看出，线程池0-2用完后，释放，再放入3-5，如此循环，直到走完全部循环
 * @author Administrator
 *
 */
public class ExecutorServiceTest {
  public static void main(String[] args) {
    ExecutorServiceTest test = new ExecutorServiceTest();
    test.init();
  }
  
  private void init() {
    ExecutorService es = Executors.newFixedThreadPool(3);
    
    for (int i = 0; i < 10; i++) {
      final int a = i;
      es.execute(new Runnable() {
        
        @Override
        public void run() {
          for (int i = 0; i < 5; i++) {
            System.out.println("线程池 " + a + "  的" + Thread.currentThread().getName() + "第" + i + "次循环");
          }
        }
      });
    }
  }
}