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线程池

主要是为了提升性能，线程重复利用。每个线程都创建十分消耗性能。线程池就像共享单车。

package Thread;import java.util.concurrent.Executor;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;public class TestThreadPool {    public static void main(String[] args) {        ExecutorService service = Executors.newFixedThreadPool (10);//第一步        service.execute (new MyThread ());//第二部        service.execute (new MyThread ());        service.execute (new MyThread ());        service.execute (new MyThread ());        service.submit (new MyThread ());//有返回值，但是我也不知道怎么用？        service.shutdown ();//关闭线程池    }}class MyThread implements Runnable{    @Override    public void run() {        System.out.println (Thread.currentThread ().getName ());    }}