Foreach 对 HashMap 无效？和一般优先级队列问题
public static void Dijk(HashMap<String, HashMap<String, Integer>> map, String go, String stop){
PriorityQueue pq = new PriorityQueue();
for (String x: map){
}
}
为什么编译器告诉我不能在这里使用 foreach 循环？
另外，这是大型程序的较小部分，但我对优先级队列没有太多经验，我想用它来保存
提前感谢您的帮助/回答！
public static void Dijk(HashMap<String, HashMap<String, Integer>> map, String go, String stop){
PriorityQueue pq = new PriorityQueue();
for (String x: map){
}
}
Why is the complier telling me I can't use a foreach loop here?
Also this is smaller section of a large program but I haven't had much experience with priority queues I want to use it to hold a <String, int> //or Integer am I doing this right? (Im using the PQ as a binary heap essentially) (this method will be implementing Dijkstra's algorithm)
Thank you for your help/answers in advance!
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假设你打算迭代HashMap的键，你应该尝试
至于优先级队列，看看Java集合PriorityQueue
Assuming you intend to iterate over the keys of the HashMap, you should try
As for the priority queue, take a look at the Java collection PriorityQueue