ThreadPoolExecutor

public ThreadPoolExecutor(int corePoolSize,  int maximumPoolSize, long keepAliveTime,TimeUnit unit,
BlockingQueue workQueue,ThreadFactory threadFactory,RejectedExecutionHandler handler) {        
     if (corePoolSize < 0 ||maximumPoolSize <= 0 ||maximumPoolSize < corePoolSize ||keepAliveTime < 0)                                                                                                       
         throw new IllegalArgumentException();       
     if (workQueue == null || threadFactory == null || handler == null)            
          throw new NullPointerException();        
      this.corePoolSize = corePoolSize; //       
      this.maximumPoolSize = maximumPoolSize;   // 
      this.workQueue = workQueue;//
      this.keepAliveTime = unit.toNanos(keepAliveTime);  //       
      this.threadFactory = threadFactory;//         
      this.handler = handler;//
     }