Gson: @Expose vs @SerializedName

Gson: @Expose vs @SerializedName

In Gson, both @Expose and @SerializedName are annotations used to customize the serialization and deserialization of Java objects to and from JSON. They serve different purposes:

  1. @Expose:

    • @Expose is an annotation provided by Gson that is used to specify whether a field should be included in the serialization and deserialization process.
    • By default, Gson includes all fields in the serialization and deserialization process. However, when you annotate a field with @Expose and set its serialize and deserialize attributes to false, you can exclude that field from one or both of these processes.
    • This annotation is often used to control which fields are included in the JSON output when you want to exclude certain fields from serialization or deserialization.

    Example:

    public class Person { @Expose private String name; @Expose(serialize = false, deserialize = true) private int age; }

  2. @SerializedName:

    • @SerializedName is another annotation provided by Gson that allows you to specify the name of the JSON field that should be mapped to a Java field.
    • This annotation is particularly useful when the JSON field names do not match the Java field names exactly. By specifying the value attribute of @SerializedName, you can specify the exact JSON field name to be used during serialization and deserialization.
    • It is primarily used for mapping Java fields to JSON fields with different naming conventions.

    Example:

    public class Person { @SerializedName("full_name") private String name; @SerializedName("person_age") private int age; }

In summary, @Expose is used for controlling which fields are included or excluded from serialization and deserialization, while @SerializedName is used for mapping Java field names to specific JSON field names. You can use these annotations in combination to fine-tune the serialization and deserialization process according to your needs.

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