newFixedThreadPool固定线程使用

1.newFixedThreadPool固定线程池，  使用完毕必须手动关闭线程池， 否则会一直在内存中存在，

 package ThreadTest;

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

 public class Demo01 {
     public static void main(String[] args) {
         MyThread myThread = new MyThread();
         ExecutorService pool = Executors.newFixedThreadPool(4);
         for(int i=0; i<40; i++) {
             pool.execute(myThread);
         }
         pool.shutdown();
     }
 }

 class MyThread implements Runnable{
     @Override
     public void run() {
         for(int i=0; i<30; i++) {
             System.out.println(Thread.currentThread().getName());
         }
     }

 }