Here is an example of how to use the MappingJsonFactory class from the com.fasterxml.jackson.databind package in Java:

import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.databind.ObjectMapper;

public class MyClass {
    public static void main(String[] args) throws Exception {
        JsonFactory factory = new MappingJsonFactory();
        ObjectMapper mapper = new ObjectMapper(factory);

        // Example of deserializing JSON to a Java object
        MyObject obj = mapper.readValue("{\"name\":\"John\",\"age\":30}", MyObject.class);
        System.out.println(obj.getName()); // prints "John"
        System.out.println(obj.getAge()); // prints 30

        // Example of serializing a Java object to JSON
        String json = mapper.writeValueAsString(obj);
        System.out.println(json); // prints {"name":"John","age":30}
    }
}

class MyObject {
    private String name;
    private int age;

    // getters and setters
}

This example creates an instance of MappingJsonFactory and uses it to create an instance of ObjectMapper. The ObjectMapper class is used to convert between JSON and Java objects. In this example, it is used to deserialize JSON into a MyObject instance and to serialize a MyObject instance to JSON.