How to Deserialize List Objects with Gson Using TypeToken?

Deserialization of List Objects with Gson

When attempting to transfer a list object via Google Gson, difficulties arise due to the need to deserialize generic types. A straightforward approach is to utilize the TypeToken class.

TypeToken Class Usage

To capture the generic type at compile time, use the following syntax:

Type listType = new TypeToken<List<MyClass>>(){}.getType();

Deserialization

With the captured type, deserialization can be performed as follows:

List<MyClass> myClassList = new Gson().fromJson(result, listType);

Additional Notes

• Compile-Time Type Capture: TypeToken captures types that are fully known at compile time.
• Parameterized Types: TypeToken can represent parameterized instantiations of generic types.
• Anonymous Subclass: An anonymous subclass of TypeToken is necessary due to the lack of a public constructor in the class.

By leveraging the TypeToken class, the transfer and deserialization of lists with generic types using Gson can be achieved efficiently.

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