在不使用关系数据库的情况下,使用Java存储和检索对象的简便方法？

import com.mongodb.MongoClient;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoDatabase;
import org.bson.Document;

public class MongoExample {
    public static void main(String[] args) {
        MongoClient mongoClient = new MongoClient("localhost", 27017);
        MongoDatabase database = mongoClient.getDatabase("mydb");
        MongoCollection<Document> collection = database.getCollection("mycol");

        // 创建一个Java对象
        MyObject obj = new MyObject("Hello", 123);

        // 将Java对象转换为MongoDB文档
        Document doc = new Document("name", obj.getName()).append("value", obj.getValue());

        // 将文档插入到集合中
        collection.insertOne(doc);

        // 查询文档并将其转换回Java对象
        Document query = new Document("name", "Hello");
        Document result = collection.find(query).first();
        MyObject retrievedObj = new MyObject(result.getString("name"), result.getInteger("value"));

        System.out.println(retrievedObj);
    }
}