Here is an example of using the ClassNameIdResolver class in the com.fasterxml.jackson.databind package in Java:

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.jsontype.impl.ClassNameIdResolver;

public class Example {
    public static void main(String[] args) throws Exception {
        ObjectMapper mapper = new ObjectMapper();
        ClassNameIdResolver idResolver = new ClassNameIdResolver(mapper.getTypeFactory());
        // Use idResolver to resolve class names to ids and vice versa
    }
}

This example creates an instance of the ObjectMapper class, which is used to convert between Java objects and JSON. It also creates an instance of the ClassNameIdResolver class, which can be used to resolve class names to ids and vice versa.

This is a basic example. In real world usage, you'll need to register the ClassNameIdResolver to ObjectMapper using mapper.registerSubtypes(..) or mapper.enableDefaultTyping(..) method and use it while deserializing and serializing the object.