Does java have an indexed minimum priority queue?

问题:

I need it for an implementation of Dijkstra's algorithm, and I do have my own implementation but documenting my code would be easier with java's own classes.

回答1:

No, Java standard library has no such data structure. I think most people use this: http://algs4.cs.princeton.edu/24pq/IndexMinPQ.java.html

回答2:

What do you mean 'indexed'? Priority queue doesn't support indexing, unless it won't be queue any more.

Java supports standard Priority Queue like C++ STL. It can be found in java.util namespace as PriorityQueue.