How do you exclude fields from serialization in GSON?

A) By using the @Expose annotation

B) By using the @SerializedName annotation

C) By overriding the toString() method

D) By setting a flag in the JSON

Answer:

A) By using the @Expose annotation

Explanation:

In GSON, you can exclude fields from serialization by using the @Expose annotation in combination with a custom Gson instance that is configured to respect the annotation. The @Expose annotation can be applied to fields that should be included or excluded from the JSON output.

For example:


public class SomeClass {
    @Expose
    private String name;

    private int age;
}

Gson gson = new GsonBuilder().excludeFieldsWithoutExposeAnnotation().create();
String json = gson.toJson(someObject);

In this example, only the name field, which is annotated with @Expose, will be included in the JSON output, while the age field will be excluded.

Reference links:

https://www.javaguides.net/p/top-java-libraries.html