newFixedThreadPool固定線程使用

1.newFixedThreadPool固定線程池，  使用完畢必須手動關閉線程池， 否則會一直在內存中存在，

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());
        }
    }
    
}