How to keep fields sequence in Gson serialization

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You’d need to create a custom JSON serializer.

E.g.

public class FooJsonSerializer implements JsonSerializer<Foo> {

    @Override
    public JsonElement serialize(Foo foo, Type type, JsonSerializationContext context) {
        JsonObject object = new JsonObject();
        object.add("bar", context.serialize(foo.getBar());
        object.add("baz", context.serialize(foo.getBaz());
        // ...
        return object;
    }

}

and use it as follows:

Gson gson = new GsonBuilder().registerTypeAdapter(Foo.class, new FooJsonSerializer()).create();
String json = gson.toJson(foo);
// ...

This maintains the order as you’ve specified in the serializer.

See also:

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