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String[] modalidades = new String[precos.size()];
int i = 0;
for (Map.Entry<String, Preco> entry : precos.entrySet()) {
    Gson gson = new Gson();
    JsonElement jsonElement = gson.toJsonTree(entry.getValue());
    Preco p = gson.fromJson(jsonElement, Preco.class);

    modalidades[i] = p.getNome();
    i++;
}