阻塞队列

    阻塞队列不同于普通的对列，当队列为空的时候，take元素就会一直阻塞住，当队列满的时候，put也会阻塞住。下面为进队和出队的源码：

public class BlockingQueue {    private List queue = new LinkedList();    private int  limit = 10;    public BlockingQueue(int limit){        this.limit = limit;    }    public synchronized void enqueue(Object item) throws InterruptedException  {        while(this.queue.size() == this.limit) {            wait(); //进队的时候，如果已经队满则阻塞        }        if(this.queue.size() == 0) {            notifyAll();         }        this.queue.add(item);    }    public synchronized Object dequeue() throws InterruptedException{        while(this.queue.size() == 0){            wait(); //出队的时候，如果队空，则阻塞        }        if(this.queue.size() == this.limit){            notifyAll();        }        return this.queue.remove(0);    }}