Java Tutorial #51 - Java PriorityQueue Class with Examples (Collections)
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- čas přidán 7. 09. 2024
- Java Tutorial #51 - Java PriorityQueue Class with Examples (Collections)
In this video by Programming for Beginners we will learn Java PriorityQueue Class with Examples, using Java Tutorial videos.
The PriorityQueue class provides the functionality of the heap data structure.
Unlike normal queues, priority queue elements are retrieved in sorted order.
Suppose, we want to retrieve elements in the ascending order. In this case, the head of the priority queue will be the smallest element. Once this element is retrieved, the next smallest element will be the head of the queue.
NOTE: The elements of a priority queue may not be sorted. However, elements are always retrieved in sorted order.
PriorityQueue Methods:
add() method
offer() method
peek() method
remove() method
poll() method
Using Iterator for PriorityQueue objects.
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Thanks for watching :)
I am very confused about this concept.. now it's all cleared my doubts .. thank you
Glad to hear that
At last I understood the algorithm behind the priority queue...really nice work buddy.👌
Thank you so much.. please share with your friends and subscribe to the channel 🙂👍
Very impressive and wow presentation
Thank you 😊
For a capacity-constrained queue, the difference between add() and offer() methods are,
add() always returns true and throws an exception if it can't add the element, whereas
offer() is allowed to return false if it can't add the element.
Don't know if you'll see this message but why would anyone use add() over offer() if add() might error and offer() won't?
@@thesquarefish
if you know that the queue has enough capacity to hold the element you want to add, it is generally better to use the add() method. On the other hand, if you are not sure whether the queue has enough capacity or not, or if you want to handle queue overflow gracefully, you can use the offer() method.
And actually add() method was created first . After sometimes, from the problem faced by the add() ,offer() has been created. So most text books are using the old methods as an example for adding elements in a priority queue, these youtube videos are also teaching in traditional bookish way. But offer() is good compared to add() we can use that too, totally our choice.
@@jeyanthan360 But from a purely functional standpoint, offer() is always equal to or better than add()?
@@thesquarefish Yessss u r Right
@@jeyanthan360 Ok thank u for answering
Wow 👍
Thanks 👍
You r good.. but lil bit more knowledge is there then it will be good
Ok
why it is 1 3 2 4 why not 1 2 3 4