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