Iterate over JsonObject properties

Question

I would like to iterate through the big wrapping JsonObject with Gson. My final aim is to get an ArrayList of all existing three digit code

Answer 1

You can use entrySet to iterate over the members of the outermost JsonObject.

JsonObject object;
ArrayList<Integer> codes = new ArrayList<Integer>();
for (Map.Entry<String,JsonElement> entry : object.entrySet()) {
    JsonArray array = entry.getValue().getAsJsonObject().getAsJsonArray("unterfeld");
    for (JsonElement codeHolder : array) {
        codes.add(codeHolder.getAsJsonObject().getAsJsonPrimitive("code").getAsInt());
    }
}