遍历列表 <Map<Integer, Map<Long, Integer> &gt;&gt;用Java

Question

As my title suggests, I'm struggling with looping through the data structure given.

I have a List of Maps which contain an Integer key and a Map value which contains a Long and an Integer.

How can I loop through the list, then map, then map to be able to access all of the required fields?

Thanks.

EDIT: In response to the comments, the looping through the list I'm fine with. So step one is to loop through the list, so I'm then left with:

for (Map<Integer, Map<Long, Integer>> periodScores : request.getPeriodScoreMap()) {
...
}

It's what goes in there that confuses me.

Currently I have:

for (Map<Integer, Map<Long, Integer>> periodScores : request.getPeriodScoreMap()) {
        while (periodScores.entrySet().iterator().hasNext()) {
            Map<Integer, Map<Long, Integer>> opponentScores =
                    (Map<Integer, Map<Long, Integer>>) periodScores.entrySet().iterator().next();
        }
    }

And I'm struggling to get into that final Map of

Answer 1

its just matter of being careful and being able to differentiate between map and list iterations

here is just an example:

for ( Map<Integer, Map<Long, Integer>> level1 : list){
   for(Map.Entry<Integer,Map<Long, Integer>> level2 : level1.entrySet() ){
      for(Map.Entry<Long,Integer> level3 : level2.getValue().entryList(){ 
      }
   }
}

Answer 2

Try this ;)

 List<Map<Integer, Map<Long, Integer>>> myList = new LinkedList<>();
    for(Map<Integer,Map<Long,Integer>> myListMap: myList){
        for(Entry<Integer, Map<Long,Integer> myListMapEntry : myListMap.entrySet()){
             Integer myListMapEntryInt = myListMapEntry.getKey();
             for(Entry<Long, Integer> myListMapEntryValue : myListMapEntry.getValue()){
                    Long myListMapEntryValueLong = myListMapEntryValue.getKey();
                    Integer myListMapEntryValueInteger = myListMapEntryValue.getValue();
             }
        }
    }

Answer 3

If the list of Maps is : List>> list; Then you can access each Integer in the innermost map as follows:

 for(Map<Integer,Map<Long,Integer>> outerMap : list){
        for(Integer innerMapKeys : outerMap.keySet()){
            Map<Long,Integer> innerMap = outerMap.get(innerMapKeys);
            for(Long key:innerMap.keySet()){
                System.out.println(innerMap.get(key)); 
            }
        }
    }