How to Deserialize a List Object Using Gson?

How to Deserialize a List Object with Gson?

When working with generic types, you may encounter difficulties deserializing them with Google Gson. The problem arises because Java's type erasure mechanism removes the type information at compile time, making it challenging to deserialize generic types effectively.

One common approach involves using the TypeToken class:

import java.lang.reflect.Type;
import com.google.gson.reflect.TypeToken;

Type listType = new TypeToken<ArrayList<YourClass>>(){}.getType();
ArrayList<YourClass> yourClassList = new Gson().fromJson(jsonArray, listType);

When using this method, you specify the generic type within the TypeToken constructor. This ensures that the runtime Type object captures the parameterized type information, allowing Gson to correctly deserialize the generic collection.

Alternatively, you can use the TypeAdapter interface to handle deserialization and serialization of custom types manually. However, this approach requires more effort and code maintenance, making the TypeToken method a convenient and efficient option for deserializing generic types in Gson.

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