我刚开始用 java 编码,我正在努力设置延迟队列,
我想拥有它,
DelayQueue queue = new DelayQueue();如果(计数器 > 0){queue.offer(Integer, *自定义延迟*)} 别的 {queue.offer(Integer, *不同的自定义延迟*)}我只是想学习所有基础知识,但我阅读了 API,但似乎无法掌握它.
提前致谢
解决方案DelayQueue 在内部保留元素,直到某个延迟到期.元素必须实现接口java.util.concurrent.Delayed.
例如我创建了一个类 DelayedTest 扩展延迟接口.这将实现 compareTo 和 getDelay() 方法
公共类 A{公共静态无效主(字符串...参数){延迟队列 dq=新延迟队列();DeleyedTest ob1=new DeleyedTest(10);DeleyedTest ob2=new DeleyedTest(5);DeleyedTest ob3=new DeleyedTest(15);dq.offer(ob1);dq.offer(ob2);dq.offer(ob3);迭代器 itr=dq.iterator();而(itr.hasNext()){DeleyedTest dt=(DeleyedTest)itr.next();System.out.println(dt.deleyTime);}}}类 DeleyedTest 实现延迟{公共长deleyTime=0;DeleyedTest(long deleyTime){this.deleyTime=deleyTime;}@覆盖公共 int compareTo(延迟 ob){if(this.deleyTime<((DeleyedTest)ob).deleyTime){返回-1;}else if(this.deleyTime>((DeleyedTest)ob).deleyTime){返回 1;}返回0;}@覆盖public long getDelay(TimeUnit unit) {返回 unit.convert(deleyTime-System.currentTimeMillis(),TimeUnit.NANOSECONDS);}}结果:
51015I'm just starting out coding in java i'm in struggling with setting up a DelayQueue,
I wanted to have it so,
DelayQueue queue = new DelayQueue(); If (counter > 0){ queue.offer(Integer, *A custom delay*) } Else { queue.offer(Integer, *A different custom delay*) }I'm just trying to learn all the basics and ive read over the API and cant seem to grasp it.
Thanks in advance
解决方案The DelayQueue keeps the elements internally until a certain delay has expired. The elements must implement the interface java.util.concurrent.Delayed.
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); } }Result:
5 10 15
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