I have the following HashMap :
HashMap<Integer,HashMap<Integer,ArrayList<Integer>>> hm = new HashMap<>();
When I do this:
Set<Integer> keys = hm.keySet();
for(int i : keys) System.out.println(i + ": " +hm.get(i));
I have an output like this:
2: {2=[1, 2, 3, 4]}
How can I go through the HashMap principal, to have access to the keys and values of HashMap inner?
You should do this separately, ie go through the main and for each iteration go through the secondary.
code:
for(Map.Entry<Integer,HashMap<Integer,ArrayList<Integer>>> kv: hm.entrySet()){
//percorre map principal
System.out.println("Key: "+kv.getKey()); //chave do principal
//busca o map inferior dessa key
HashMap<Integer,ArrayList<Integer>> secondmap= kv.getValue();
//percorre o map inferior
for(Map.Entry<Integer,ArrayList<Integer>> kvv: secondmap.entrySet() ){
//faz o print da chave e de todos os valores do arraylist
for (int valor : kvv.getValue()){
System.out.println("Key: "+kvv.getKey() + "value "+valor;
}
}
}