Java如何在没有100%CPU负载的情况下持续监控某些内容？

Question

我可以将while循环与wait()和notify()/ notifyall()一起使用吗？

编辑:我希望waitfornextprice方法的else条件只对putPrice方法执行.

public synchronized void putPrice(String s,int i) {
     if (getPrice(s) != i){
         this.Prices.put(s, i);
         notify();
     } 
}

public synchronized int waitForNextPrice(String s) {
    int b = null;
    if (hasPriceChanged(s)==true){
        b = getPrice(s);
    }
    else{
        //Need to block here, until putPrice() is called again
        while(hasPriceChanged(s)==false) wait();

        //Once putPrice has been called, b = getPrice();
        b = getPrice(s);
    }
    return b;
}

Answer 1

假设你想要监视的东西能够调用notify/ notifyAll,这是典型的做法,是的.

如果它无法通知您,您可以进行轮询......但最好使用wait/ "推送"通知notify.