What are the different types of queues in Java?

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Different Types of Queues in Java 

In Java, a Queue is a data structure that follows the FIFO (First-In-First-Out) principle. Java provides several queue implementations in the java.util and java.util.concurrent packages, each suited for different use cases.

1. LinkedList

• Implements both List and Queue interfaces.

• Can be used as a simple queue or deque.

• Allows null elements.

• Not thread-safe.

2. PriorityQueue

• Elements are ordered based on natural ordering or a custom comparator.

• Doesn’t allow null elements.

• Not thread-safe.

• Useful for priority-based processing.

3. ArrayDeque

• A resizable array that implements a deque (double-ended queue).

• Faster than LinkedList for stack and queue operations.

• Doesn’t allow null elements.

• Not thread-safe.

4. ConcurrentLinkedQueue

• A thread-safe, non-blocking queue based on a linked node structure.

• Suitable for high-concurrency scenarios.

• Doesn’t block threads during operations.

5. BlockingQueue (Interface)

• Supports operations that wait for the queue to become non-empty or for space to become available.

• Common implementations:

  • ArrayBlockingQueue: Bounded, backed by an array.

  • LinkedBlockingQueue: Optional bounded, backed by linked nodes.

  • PriorityBlockingQueue: Priority-based, unbounded.

  • DelayQueue: Elements become available after a delay.

6. Deque Interface

• Supports insertion/removal at both ends.

• Implemented by ArrayDeque and LinkedList.

Each queue serves different needs, from simple data storage to concurrent task handling. Choose based on performance, order, and concurrency needs.

Read more: 

How does ConcurrentHashMap work?

What is the difference between HashSet and TreeSet?

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