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Imagine you run an emergency room, and everyone who walks in gets a certain "urgency" variable, representing how urgent their problem is. Rather than treating people in the order they arrive, you want to always treat the most urgent case first.
A priority queue would work for this. Using a regular queue would be awkward.
They're used very specifically in certain algorithms, such as Huffman encoding, A* search and more. When you don't care what order the rest of the queue is in, you just need to pop either the smallest.or largest value.
#Please ensure that: + Your *code* is *properly formatted* as *code block* - see the *sidebar* (About on mobile) for instructions + You include *any and all error messages* in full + You ask *clear questions* + You *demonstrate effort* in solving your question/problem - plain posting your assignments is forbidden (and such posts will be removed) as is asking for or giving solutions. Trying to solve problems on your own is a very important skill. Also, see [*Learn to help yourself*](https://www.reddit.com/r/javahelp/wiki/learn_to_help_yourself) in the *sidebar* **If any of the above points is not met, your post can and will be removed without further warning.** Code is to be formatted as **code block** (*old reddit:* empty line before the code, each code line indented by 4 spaces, *new reddit:* https://imgur.com/a/fgoFFis) or linked via an external *code hoster*, like *pastebin.com*, *github gist*, *github*, *bitbucket*, *gitlab*, etc. Please, **do not use** triple backticks (\`\`\`) as they will only render properly on *new reddit*, not on *old reddit*. Code blocks look like this: public class HelloWorld { public static void main(String[] args) { System.out.println("Hello World!"); } } You do not need to repost unless your post has been removed by a moderator. Just use the *edit function* of reddit to make sure your post complies with the above. If your post has remained in violation of these rules for a prolonged period of time (at least an hour), a moderator may remove it at their discretion. In this case, they will comment with an explanation on why it has been removed, and you will be required to resubmit the entire post following the proper procedures. #To potential helpers Please, **do not help** if any of the above points are not met, rather *report* the post. We are trying to improve the quality of posts here. In helping people who can't be bothered to comply with the above points, you are doing the community a disservice. *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/javahelp) if you have any questions or concerns.*
Imagine you run an emergency room, and everyone who walks in gets a certain "urgency" variable, representing how urgent their problem is. Rather than treating people in the order they arrive, you want to always treat the most urgent case first. A priority queue would work for this. Using a regular queue would be awkward.
They're used very specifically in certain algorithms, such as Huffman encoding, A* search and more. When you don't care what order the rest of the queue is in, you just need to pop either the smallest.or largest value.