java-tutorials/libraries-data/src/main/java/com/baeldung/kryo/PersonSerializer.java

package com.baeldung.kryo;

import com.esotericsoftware.kryo.Kryo;
import com.esotericsoftware.kryo.Serializer;
import com.esotericsoftware.kryo.io.Input;
import com.esotericsoftware.kryo.io.Output;
import java.util.Date;

public class PersonSerializer extends Serializer<Person> {

    @Override
    public void write(Kryo kryo, Output output, Person object) {
        output.writeString(object.getName());
        output.writeLong(object.getBirthDate()
            .getTime());
    }

    @Override
    public Person read(Kryo kryo, Input input, Class<Person> type) {
        Person person = new Person();
        person.setName(input.readString());
        long birthDate = input.readLong();
        person.setBirthDate(new Date(birthDate));
        person.setAge(calculateAge(birthDate));
        return person;
    }

    private int calculateAge(long birthDate) {
        // Some custom logic
        return 18;
    }

}