<prompt> Kuandika programu ya Java kuuliza mongoDB kwa faili ya json kwa mtumiaji Alexander.  <response>: Heres an example Java code to query MongoDB for a JSON file for user Alexander:import com.mongodb.DB;import com.mongodb.DBCollection;import com.mongodb.MongoClient;import com.mongodb.util.JSON;public class MongoDBExample public static void mainString args try Connect to MongoDB MongoClient mongo new MongoClientlocalhost, 27017; Access database named test DB db mongo.getDBtest; Access collection named users DBCollection collection db.getCollectionusers; Query for user Alexander String query name:Alexander; Find the json document for Alexander String json collection.findOneJSON.parsequery.toString; Output the result System.out.printlnjson; Close the connection mongo.close; catch Exception e System.err.printlne.getClass.getName : e.getMessage; This example uses the MongoDB Java Driver to connect to a local MongoDB instance, access the test database, and query the users collection for a user named Alexander. The result is printed to the console.Note that the query is passed as a string parameter to the findOne method, and is parsed using the JSON.parse method. This allows you to construct arbitrary queries as JSON strings, which is a useful feature when querying MongoDB from Java. 