concurrent实用类

improt java.util.concurrent.atomic.AtomicLong;

import java.util.concurrent.RejectedExecutionHandler; 拒绝任务

import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.CopyOnWriteArrayList; 
import java.util.concurrent.ScheduledThreadPoolExecutor;

import java.util.concurrent.ExecutorService; 
import java.util.concurrent.LinkedBlockingQueue; 

import java.util.concurrent.Callable; 

5 import java.util.concurrent.Executors; 
6 import java.util.concurrent.FutureTask;