public static ExecutorService newFixedThreadPool(int nThreads) {
        return new ThreadPoolExecutor(nThreads, nThreads,
                                      0L, TimeUnit.MILLISECONDS,
                                      new LinkedBlockingQueue<Runnable>());
    }

    public static ExecutorService newSingleThreadExecutor() {
        return new FinalizableDelegatedExecutorService
            (new ThreadPoolExecutor(1, 1,
                                    0L, TimeUnit.MILLISECONDS,
                                    new LinkedBlockingQueue<Runnable>()));
    }

     public static ExecutorService newCachedThreadPool() {
        return new ThreadPoolExecutor(0, Integer.MAX_VALUE,
                                      60L, TimeUnit.SECONDS,
                                      new SynchronousQueue<Runnable>());
    }

    public static ScheduledExecutorService newScheduledThreadPool(
            int corePoolSize, ThreadFactory threadFactory) {
        return new ScheduledThreadPoolExecutor(corePoolSize, threadFactory);
    }
    public ScheduledThreadPoolExecutor(int corePoolSize,
                                       ThreadFactory threadFactory) {
        //这里super是ThreadPoolExecutor类
        super(corePoolSize, Integer.MAX_VALUE, 0, NANOSECONDS,
              new DelayedWorkQueue(), threadFactory);
    }
    

class Temp extends Thread {
    public void run() {
        try {
            System.out.println( new Date().toString() + "..run start");
            Thread.sleep(3000);
            System.out.println( new Date().toString() + "...run end");
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

public class ScheduledJob {
    
    public static void main(String args[]) throws Exception {
    
        Temp command = new Temp();
        ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1);
        System.out.println(new Date().toString() + "...start");
        //scheduler.scheduleWithFixedDelay(command, 5, 2, TimeUnit.SECONDS);
        scheduler.scheduleAtFixedRate(command, 5, 2, TimeUnit.SECONDS);
    }
}

public class UseThreadPoolExecutor1 {
    public static void main(String[] args) {
        /**
         * 在使用有界队列时，若有新的任务需要执行，如果线程池实际线程数小于corePoolSize，则优先创建线程，
         * 若大于corePoolSize，则会将任务加入队列，
         * 若队列已满，则在总线程数不大于maximumPoolSize的前提下，创建新的线程，
         * 若线程数大于maximumPoolSize，则执行拒绝策略。或其他自定义方式。
         * 
         */    
        ThreadPoolExecutor pool = new ThreadPoolExecutor(
                1,                 //coreSize
                2,                 //MaxSize
                60,             //60
                TimeUnit.SECONDS, 
                new ArrayBlockingQueue<Runnable>(3)            //指定一种队列 （有界队列）
                //new LinkedBlockingQueue<Runnable>()
//                , new MyRejected()
                //, new DiscardOldestPolicy()
                );
        
        MyTask mt1 = new MyTask(1, "任务1");
        MyTask mt2 = new MyTask(2, "任务2");
        MyTask mt3 = new MyTask(3, "任务3");
        MyTask mt4 = new MyTask(4, "任务4");
        MyTask mt5 = new MyTask(5, "任务5");
        MyTask mt6 = new MyTask(6, "任务6");
        
        pool.execute(mt1);
        pool.execute(mt2);
        pool.execute(mt3);
        pool.execute(mt4);
        pool.execute(mt5);
        pool.execute(mt6);
        
        pool.shutdown();
        
    }
}

public class UseThreadPoolExecutor2 implements Runnable{

    private static AtomicInteger count = new AtomicInteger(0);
    
    @Override
    public void run() {
        try {
            int temp = count.incrementAndGet();
            System.out.println("任务" + temp);
            Thread.sleep(2000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
    
    public static void main(String[] args) throws Exception{
        //System.out.println(Runtime.getRuntime().availableProcessors());
        BlockingQueue<Runnable> queue = 
                new LinkedBlockingQueue<Runnable>();
        ExecutorService executor  = new ThreadPoolExecutor(
                    5,         //core
                    10,     //max
                    120L,     //2fenzhong
                    TimeUnit.SECONDS,
                    queue);
        
        for(int i = 0 ; i < 20; i++){
            executor.execute(new UseThreadPoolExecutor2());
        }
        Thread.sleep(1000);
        System.out.println("queue size:" + queue.size());        //10
        Thread.sleep(2000);
    }
}

public class MyTask implements Runnable {

    private int taskId;
    private String taskName;
    
    public MyTask(int taskId, String taskName){
        this.taskId = taskId;
        this.taskName = taskName;
    }
    
    public int getTaskId() {
        return taskId;
    }

    public void setTaskId(int taskId) {
        this.taskId = taskId;
    }

    public String getTaskName() {
        return taskName;
    }

    public void setTaskName(String taskName) {
        this.taskName = taskName;
    }

    @Override
    public void run() {
        try {
            System.out.println("run taskId =" + this.taskId);
            Thread.sleep(5*1000);
            //System.out.println("end taskId =" + this.taskId);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }        
    }
    
    public String toString(){
        return Integer.toString(this.taskId);
    }

}

public class MyRejected implements RejectedExecutionHandler{

    
    public MyRejected(){
    }
    
    @Override
    public void rejectedExecution(Runnable r, ThreadPoolExecutor executor) {
        System.out.println("自定义处理..");
        System.out.println("当前被拒绝任务为：" + r.toString());
    }

}