java線程池

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java線程池

java線程池通過Executors工廠類初始化線程池

1. 建立大小不固定的線程池

使用ExecutorService es = Executors.newCachedThreadPool();

產生大小不固定的線程池，

es.excute(任務)

 

public class ThreadPoolTest {    public static class Taskdemo implements Runnable{        @Override        public void run() {            for(int i = 0;i < 10;i++){                System.out.println(Thread.currentThread().getName()+":"+i);            }        }    }    public static void main(String[] args){        ExecutorService es = Executors.newCachedThreadPool();        for(int i = 0;i< 11 ;i++){            Taskdemo tc = new Taskdemo();            es.execute(tc);        }    }}

 

 

2. 產生線程大小固定的線程池

ExcutorService es= Excutors.newFixedThreadPool(2);

public static void main(String[] args) {        ExecutorService es=Executors.newFixedThreadPool(2);        for(int i=0;i<10;i++){            Taskdemo tc=new Taskdemo();            es.execute(tc);        }        es.shutdown();}

 

3. 產生單個線程的線程池

public static void main(String[] args){        ExecutorService es = Executors.newSingleThreadExecutor();        for(int i = 0;i< 11 ;i++){            Taskdemo tc = new Taskdemo();            es.execute(tc);        }}

 

4. 產生一個定時的線程池

public static void main(String[] args){        ScheduledExecutorService es = Executors.newScheduledThreadPool(2);        for(int i = 0;i< 11 ;i++){            Taskdemo tc = new Taskdemo();            es.scheduleAtFixedRate(tc,30,10, TimeUnit.SECONDS);        }}

 

含義是：程式運行開始，30s開始執行，每個十秒重新執行一次。

 

java線程池