如何在Java中正确使用多线程的MongoDB？

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

public class MongoDBMultiThreadExample {

    public static void main(String[] args) {
        // 创建MongoDB连接
        MongoClient mongoClient = new MongoClient("localhost", 27017);

        // 获取数据库和集合对象
        MongoDatabase database = mongoClient.getDatabase("mydb");
        MongoCollection<Document> collection = database.getCollection("mycollection");

        // 创建并启动多个线程
        Thread thread1 = new MyThread(collection);
        Thread thread2 = new MyThread(collection);
        thread1.start();
        thread2.start();

        // 等待所有线程执行完毕
        try {
            thread1.join();
            thread2.join();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        // 关闭MongoDB连接
        mongoClient.close();
    }

    static class MyThread extends Thread {
        private MongoCollection<Document> collection;

        public MyThread(MongoCollection<Document> collection) {
            this.collection = collection;
        }

        @Override
        public void run() {
            // 执行数据库操作
            // ...
        }
    }
}