java线程状态图

public class RequestQueue {

    private Queue<Request> requestQueue = new LinkedList<Request>();

    public synchronized Request getRequest(){
        while(requestQueue.size() == 0){
            try {
                wait(); //I
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        return requestQueue.remove();
    }

    public synchronized void putRequst(Request request){
        requestQueue.add(request);
        notifyAll(); //此处执行后,将I处等待队列的所有线程唤醒
    }// 该方法执行完后,从锁池选取一个线程,置为就绪状态
}