If a Java class is a generic type and we are using it with the Gson library for JSON serialization and deserialization. The Gson library provides a class called com.google.gson.reflect.TypeToken to store generic types by creating a Gson TypeToken class and pass the class type. Using this type, Gson can able to know the class passed in the generic class.
public class TypeToken<T> extends java.lang.Object
import java.lang.reflect.Type;
import java.util.*;
import com.google.gson.*;
import com.google.gson.reflect.*;
public class GenericTypesJSONTest {
public static void main(String[] args) {
Gson gson = new GsonBuilder().setPrettyPrinting().create();
List<String> list = Arrays.asList("INDIA", "AUSTRALIA", "ENGLAND", "SOUTH AFRICA");
String jsonStr = gson.toJson(list);
System.out.println(jsonStr);
Type listType = new TypeToken<List<String>>() {}.getType();
list = gson.fromJson(jsonStr, listType);
System.out.println(list);
}
}[ "INDIA", "AUSTRALIA", "ENGLAND", "SOUTH AFRICA" ] [INDIA, AUSTRALIA, ENGLAND, SOUTH AFRICA]
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