如何设置DelayQueue的延迟 [英] How do i set up a DelayQueue's Delay

问题描述

我刚开始使用Java进行编码，我正努力设置DelayQueue，

I'm just starting out coding in java i'm in struggling with setting up a DelayQueue,

我想这样做，

DelayQueue queue = new DelayQueue();

If (counter > 0){
queue.offer(Integer, *A custom delay*)
} Else {
queue.offer(Integer, *A different custom delay*)
}

我只是在尝试学习所有基础知识

I'm just trying to learn all the basics and ive read over the API and cant seem to grasp it.

预先感谢

推荐答案

DelayQueue 在内部保留元素，直到达到一定的延迟为止。元素必须实现 java.util.concurrent.Delayed 接口。

The DelayQueue keeps the elements internally until a certain delay has expired. The elements must implement the interface java.util.concurrent.Delayed.

例如，我创建了一个类 DelayedTest 扩展了Delayed接口。这将实现compareTo和getDelay（）方法

For example I have created a class DelayedTest extending Delayed interface. This will implement compareTo and getDelay() method

public class A{
    public static void main(String... args){
        DelayQueue  dq=new DelayQueue();
        DeleyedTest ob1=new DeleyedTest(10);
        DeleyedTest ob2=new DeleyedTest(5);
        DeleyedTest ob3=new DeleyedTest(15);

        dq.offer(ob1);
        dq.offer(ob2);
        dq.offer(ob3);

        Iterator itr=dq.iterator();
        while(itr.hasNext()){
            DeleyedTest dt=(DeleyedTest)itr.next();
            System.out.println(dt.deleyTime);
        }
    }
}
class DeleyedTest implements Delayed{
    public long deleyTime=0;
    DeleyedTest(long deleyTime){
        this.deleyTime=deleyTime;
    }

    @Override
    public int compareTo(Delayed ob) {
        if(this.deleyTime<((DeleyedTest)ob).deleyTime){
            return -1;
        }else if(this.deleyTime>((DeleyedTest)ob).deleyTime){
            return 1;
        }
        return 0;
    }
    @Override
    public long getDelay(TimeUnit unit) {
        return unit.convert(deleyTime-System.currentTimeMillis(),TimeUnit.NANOSECONDS); 
    }

}

结果：

5
10
15

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