java线程池理解

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Executors.newFixedThreadPool(2);开启一个有限的线程池

service.shutdown();是在所有线程提交给executors内部的队列后就执行。

此时，线程必定提交，但未必开始执行，未必执行完成。

package test;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;public class MyExecutor extends Thread {private int index;public MyExecutor(int i){    this.index=i;}public void run(){    try{    long time=System.currentTimeMillis();     System.out.println("["+this.index+"] start.");     Thread.sleep((int)(Math.random()*1000));     System.out.println("["+this.index+"]"+(System.currentTimeMillis()-time)+" end.");    }    catch(Exception e){     e.printStackTrace();    }}public static void main(String args[]){    ExecutorService service=Executors.newFixedThreadPool(2);    for(int i=0;i<10;i++){         service.execute(new MyExecutor(i));     System.out.println("["+i+"] into queue");     //service.submit(new MyExecutor(i));    }    service.shutdown();    System.out.println("submit finish");}}

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