What is the usage of Gson in Java?

Gson is a Java library that allows for converting Java objects into JSON format strings, and vice versa. It offers methods for serialization and deserialization, making it easy and efficient to convert between Java objects and JSON data.

The basic steps for using Gson are as follows:

Create a Gson object: You can create a Gson object by using new Gson().

Convert a Java object to a JSON formatted string by using the toJson() method. For example, String json = gson.toJson(object).

To convert a JSON-formatted string into a Java object, you can utilize the fromJson() method. For example: Object object = gson.fromJson(json, Object.class);

Configuring specific handling for Gson: Gson provides some configuration options that allow for custom handling in specific situations. For example, you can use the excludeFieldsWithoutExposeAnnotation() method to specify that only fields annotated with @Expose will be serialized and deserialized.

In addition, Gson also allows for the conversion of JSON data into JsonElement objects, and vice versa, converting JsonElement objects into JSON formatted strings. JsonElement is an abstract class that represents elements of JSON data, which can be a JSON object, a JSON array, a JSON atomic value (such as a string, number, boolean value), or a null value.

Overall, Gson offers a convenient and flexible way to handle the conversion between JSON data and Java objects.