How to use gson to convert json to arraylist if the list contain different class?

Question

I want to store an arraylist to disk, so I use gson to convert it to string

    ArrayList anim=new ArrayList();
    Cat c=new Cat         


        

Answer 1

you can use the below code to convert json to corresponding list of objects

TypeToken<List<Animal>> token = new TypeToken<List<Animal>>() {};
List<Animal> animals = gson.fromJson(data, token.getType());

Answer 2

Kotlin example:

val gson = Gson()
val typeToken = object : TypeToken<ArrayList<Animal>>() {}
val list = gson.fromJson<ArrayList<Animal>>(value, typeToken.type)

Faster way:

val gson = Gson()
val array = gson.fromJson<Array<Animal>>(value, Array<Animal>::class.java)
val arrayList = ArrayList(array.toMutableList())