![]() ![]() Do you want to be informed about new tutorials and articles? Then click here to sign up for the Happ圜 newsletter. If you still have questions, please ask them via the comment function. LinkedTransferQueue to block a producer thread until the element has been transferred to a consumer thread.SynchronousQueue to transfer elements synchronously from a producer to a consumer.DelayQueue to retrieve elements after a given waiting time.PriorityQueue and PriorityBlockingQueue to retrieve elements sorted by priority.The following queues are for special purposes: LinkedBlockingDeque as a thread-safe, blocking, bounded deque.LinkedBlockingQueue as a thread-safe, blocking, bounded queue if you expect a rather high contention between producer and consumer threads (it is best to test which implementation is better performing for your use case).ArrayBlockingQueue as a thread-safe, blocking, bounded queue, provided you expect little contention between producer and consumer threads.ConcurrentLinkedQueue and ConcurrentLinkedDeque as thread-safe, non-blocking, and unbounded queues/deques.Use ArrayDeque for single-threaded applications.The following are my recommendations for general purpose use: ![]() The usage recommendations are based on the characteristics of the JDK queue and deque implementations, which are described in more detail in the linked articles. What Java Implementations Are Available, and Which Should You Use? The differences between the respective data structures are explained in the following articles: Here is an implementation in Java.For details, see the main article about the deque data structure. Thinking on an example, let's push the array of integers C - Implementation Of Queue Constructed with Two Stacks This was important, because if we push and pop elements to the stack, the output will be exactly in reverse order of a queue. On previous part, I've explained how can we reverse the order of stack elements. You can see what happens as we do so on the image below To reverse the order of the elements, we are going to pop each element from left stack, and push them to the right stack. Let's put our populated stack to the left and our new empty stack to the right. To do the same process, we need to have a second stack that which is going to store the first stack elements in reverse order. What we can do ? We can take the bottle and hold it upside down so that all the values should reverse in order ? And we want to reverse the stack so that the top element of the stack will be 1 and bottom element of the stack will be 3. Now we have our stack represented as a bottle is populated with values 3,2,1. Lastly, 3 will be put on the top of the stack and latest state of our stack represented as a bottle will be as below Because 1 will be pushed first, then 2 will be put on the top of 1. If we push integers 1,2,3 respectively, then 3 will be on the top of the stack. Lets imagine our stack like a bottle as below The last washed dish will be on the top of the clean stack, which is called as Last In First Out (LIFO) in computer science. Remember how stack works, it is very similar to the dish stack on your kitchen. Every operation uses extra space and time to deal wih references. ![]() Every operation takes constant time O (1). Below are the advantages of using linked list for queue implementation: Grows and shrinks gracefully. To understand how to construct a queue using two stacks, you should understand how to reverse a stack crystal clear. We will be using linked list for the implementation of our custom queue. ![]()
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