Iterate through nested hashmap

Question

How would I go about iterating through a nested HashMap?

The HashMap is setup like this:

HashMap

        

Answer 1

for (Map.Entry<String, HashMap<String, Student>> letterEntry : students.entrySet()) {
    String letter = letterEntry.getKey();
    // ...
    for (Map.Entry<String, Student> nameEntry : letterEntry.getValue().entrySet()) {
        String name = nameEntry.getKey();
        Student student = nameEntry.getValue();
        // ...
    }
}

Answer 2

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

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