How to add ArrayList<String> to JSON Array - keeping type safety in mind

arraylist, java, json, type-safety

Solution

If you want to work with json go this library, this library has a nice support https://code.google.com/p/google-gson/.

This is an example:

Gson gson = new Gson();
Collection<Integer> ints = Lists.immutableList(1,2,3,4,5);

(Serialization)
String json = gson.toJson(ints); ==> json is [1,2,3,4,5]

Thanks

Problem

Eclipse displayed a type safety warning and I tried nearly everything to eradicate it (of course suppressing it would be an option) but unfortunately I hadn't any success. Do you know how I have to change my code so that there is no type safety warning anymore. Or is `@SuppressWarnings("unchecked")` the only way? ``` ArrayList<String> arrayList= (ArrayList<String>) Classname.getArrayList(); JSONArray obj = new JSONArray(); obj.addAll(arrayList); ``` in the last line following type safety warning is displayed: Type safety: The method addAll(Collection) belongs to the raw type ArrayList. References to generic type ArrayList should be parametrized JSONArray is from`org.json.simple.JSONArray`. Would you recommend another package?

Original source