Iterate through nested hashmap

Question

How would I go about iterating through a nested HashMap?

The HashMap is setup like this:

HashMap

        

Answer 1

Java 8 lambdas and Map.forEach make bkail's answer more concise:

outerMap.forEach((letter, nestedMap) -> {
    //...
    nestedMap.forEach((name, student) -> {
        //...
    });
    //...
});