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

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

public class Example {
    public static void main(String[] args) throws Exception {
        ObjectMapper mapper = new ObjectMapper();
        SimpleAbstractTypeResolver resolver = new SimpleAbstractTypeResolver();
        mapper.setAbstractTypeResolver(resolver);
        // Register subtypes
        resolver.addMapping(MyAbstractType.class, MyConcreteType.class);
    }
}

abstract class MyAbstractType {
    //...
}

class MyConcreteType extends MyAbstractType {
    //...
}

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 SimpleAbstractTypeResolver class and sets it to the ObjectMapper. With this, the SimpleAbstractTypeResolver can be used to find the concrete class for a given abstract class during deserialization.

In this example, the addMapping method is used to register MyConcreteType as the concrete class for MyAbstractType when deserializing JSON. This means that when deserializing JSON, if the MyAbstractType class is encountered, MyConcreteType will be used as the concrete class.

With this example, you can see how you can use the SimpleAbstractTypeResolver to register concrete classes for abstract classes and use it in the deserialization process with ObjectMapper.