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.
Syntax
public class TypeTokenextends java.lang.Object
Example
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 list = Arrays.asList("INDIA", "AUSTRALIA", "ENGLAND", "SOUTH AFRICA");
String jsonStr = gson.toJson(list);
System.out.println(jsonStr);
Type listType = new TypeToken>() {}.getType();
list = gson.fromJson(jsonStr, listType);
System.out.println(list);
}
} 输出
[ "INDIA", "AUSTRALIA", "ENGLAND", "SOUTH AFRICA" ] [INDIA, AUSTRALIA, ENGLAND, SOUTH AFRICA]
