通过代码，解释ExecutorService根本用法

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");
					}
				}
			});
		}
	}
}