MongoDB - 合并两个DBObject

import com.mongodb.DBObject;

public class DBObjectMerger {
    public static void main(String[] args) {
        // 创建两个DBObject
        DBObject obj1 = new BasicDBObject("name", "John").append("age", 30);
        DBObject obj2 = new BasicDBObject("address", "123 Main St").append("city", "New York");

        // 合并两个DBObject
        DBObject mergedObj = new BasicDBObject();
        mergedObj.putAll(obj1.toMap());
        mergedObj.putAll(obj2.toMap());

        // 输出合并后的DBObject
        System.out.println(mergedObj);
    }
}