A delayed queue in Java is a special type of priority queue where elements can only be taken out after a specified delay time has passed.
Elements will be taken out in order of priority once the delay time expires.
The Java delay queue utilizes a PriorityQueue internally to store elements, where elements must implement the Delayed interface to specify delay time and comparison rules.
Java DelayQueue can be used to implement scheduled task scheduling, message sending delays, and other scenarios.
The delayed queue uses ReentrantLock internally to facilitate concurrent access control, ensuring thread safety.
The Java DelayQueue offers methods like offer and poll to add and retrieve elements.
