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Explanation

First, add the MongoDB Java Driver dependency to your project (Maven example shown). This allows Java to communicate with MongoDB.

Code:

Add Maven Dependency:

<dependency>
  <groupId>org.mongodb</groupId>
  <artifactId>
    mongodb-driver-sync
   </artifactId>
  <version>4.11.1</version>
</dependency>

Explanation

Import the required MongoDB client classes.

Code:

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

Explanation

Create a MongoClient instance to connect to the MongoDB server running on localhost at port 27017.

Code:

MongoClient mongoClient = 
MongoClients.create("mongodb://hostname");

Explanation

Connect to a specific database. If the database does not exist, MongoDB will create it automatically when data is inserted.

Code:

MongoDatabase database = mongoClient.
getDatabase("testdb");
//message after sucess
System.out.println("Connected successfully!");

//closing connection
mongoClient.close();