Operations with Hashmap

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Operations with Hashmap

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Good afternoon guys, I need to do some operations using Hashmap. I am new in the area.

I have the following map

protected Map<String, Map<String, Integer>> elementos = new HashMap<>();`

The first String is a key, the value is a map that contains a key like String and an Integer value.

I need to go through all the values that are in this hashmap, that is, all the internal hashMaps. So I need to make comparisons and sort. Example:

HashMap<"texto1",HashMap<"Cachorro", 3>

HashMap<"texto2",HashMap<"Peixe", 2>

Ai would make a comparison of the type, "If "dog" == "Fish" -> Listfrequencia = (3-2); Finally, somehow, after this calculation sort by saying which text comparison is less. First post here. Java `

I didn’t understand the part of the comparison, in the part that says Se "cachorro" == "Peixe" -> Listafrequencia = (3-2); could explain otherwise?

– Math

2014/12/09 at 12:05
So, this Hashmap has a String as key and an Integer type value. The comparison I speak would be: If String equals the hashmap String, do this operation that is contained in the Integer Hashmap Type value field ( 3 for dog and 2 for fish in case.) Obs, this number is the amount of times this string is in a given string.

– rickes

2014/12/09 at 16:11

1 answer

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by Guilherme • **181** points · Answer 1 · 2014-12-08T12:52:05+00:00

If this is a learning exercise (college or course) the full statement would help, the way you explained the problem is confusing. Follow some guidance:

        Map<String, Map<String, Integer>> elementos = new HashMap<String, Map<String, Integer>>();

    //percorre  a map
    for (String key : elementos.keySet()) {

        int total = 0;

        //percorre a map interna, agrupado por chave 
        for (Integer i : elementos.get(key).values()) {
            total=i+total;
        }

        System.out.println(key + total);

    }