To connect database, you need to specify the database name, if the database doesn”t exist then MongoDB creates it automatically.

MongoDatabase database = mongo.getDatabase("myDb");

Example

Following is the code snippet to connect to the database −

import com.mongodb.MongoCredential;
import com.mongodb.client.MongoClient;
import com.mongodb.client.MongoClients;
import com.mongodb.client.MongoDatabase;

public class Tester {
   public static void main(String[] args) {
      // Creating a Mongo client 
      MongoClient mongoClient = MongoClients.create("mongodb://localhost:27017");
      MongoDatabase database = mongo.getDatabase("myDb");

      // Creating Credentials 
      MongoCredential credential; 
      credential = MongoCredential.createCredential("sampleUser", "myDb", "password".toCharArray());

      System.out.println("Credentials ::"+ credential);  
   }
}

Now, let”s compile and run the above program as shown below.

$javac Tester.java 
$java Tester

Output

On executing, the above program gives you the following output.

Credentials ::MongoCredential{mechanism=null, userName=''sampleUser'', source=''myDb'', password=<hidden>, mechanismProperties=<hidden>}