如何在 HashMap 中返回 HashMap

Question

I am trying to return the first inner HashMap of the outer HashMap, but this method I am using does not work.

public HashMap<String, Integer> getMap(HashMap<String, HashMap<String, Integer>> allQs) {
    HashMap <String, Integer> value = allQs.getValue();
    return value;
}

How can I return the object as a HashMap?

Answer 1

FYI: HashMap does not maintain the insertions order if order matters then use LinkedHashMap.

And also Hashmap does not have any method getValue() ;

If you want to get the first value then use

for(HashMap<String,Integer> innerMap : map.values())
{
    return innerMap;
}

or

map.values().stream().findFirst().get()