9.Java5线程并发库的应用

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

/**
 * java5线程并发库的应用 
 * 线程池工具类 Executors
 * 
 * @author LiTaiQing
 *
 */
public class ThreadPoolTest {

    public static void main(String[] args) {
        //固定大小的线程池
        //ExecutorService threadPool = Executors.newFixedThreadPool(3);
        //缓存线程池
        //ExecutorService threadPool = Executors.newCachedThreadPool();
        /**
         * 单一线程池（如何实现线程死掉后重新启动）
         *     此线程池的特点正好解决上述问题，如果线程挂掉，此线程池会自动创建一个线程代替挂掉的线程
         */
        ExecutorService threadPool = Executors.newSingleThreadExecutor();
        for (int i = 1; i < 10; i++) {
            final int task = i;
            threadPool.execute(new Runnable() {
                @Override
                public void run() {
                    for (int j = 0; j < 10; j++) {
                        try {
                            Thread.sleep(20);
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                        System.out.println(Thread.currentThread().getName()
                                + " is looping of " + j
                                + " for task of " + task);
                    }
                }
            });
        }
        System.out.println("all of 10 tasks have committed!");
        //当所有任务结束后关闭线程池
        //threadPool.shutdown();
        //不管所有任务是否都已结束，直接关闭线程池
        //threadPool.shutdownNow();
        //计时器
//        Executors.newScheduledThreadPool(3).schedule(new Runnable(){
//            @Override
//            public void run() {
//                System.out.println("bombing!");
//            }
//        }, 
//        6, //时间
//        TimeUnit.SECONDS);//单位
        
        /**
         * 固定频率
         * 实现6秒以后炸，以后每2秒后爆炸一次
         */
        Executors.newScheduledThreadPool(3).scheduleAtFixedRate(new Runnable(){
            @Override
            public void run() {
                System.out.println("bombing!");
            }
        }, 
        6, //时间
        2, //时间间隔
        TimeUnit.SECONDS);//单位
    }
    
    
}