Gson gives "unchecked conversion" warning

Question

I was trying to convert json strings to objects like this:

String jsonString = "[\"string1\", \"string2\"]";
Gson gson = new Gson();
List<String> list = gson.fromJson(jsonString, List.class);

There was this warning:

warning: [unchecked] unchecked conversion
            list = gson.fromJson(jsonString, List.class);
                                       ^
  required: List<String>
  found:    List

I tried to use List<String>.class

instead of List.class but I get a compile time error saying that I can't do that...

How can I get rid of this warning?

Answer 1

You can use an array

String[] array = gson.fromJson(jsonString, String[].class);

or using TypeToken

Type listType = new TypeToken<ArrayList<String>>() {}.getType();
List<String> list  = gson.fromJson(jsonString, listType);