import com.mongodb.*;
public class Test {

    public static void main(final String [] pArgs) throws Exception {

        Mongo mongo = new Mongo(new MongoURI("mongodb://localhost:27017"));
        mongo.getDB("test").dropDatabase();
        mongo.close();

        mongo = new Mongo(new ServerAddress("localhost", 27017));
        mongo.getDB("test").dropDatabase();
        mongo.close();

        mongo = new Mongo(new DBAddress("localhost", 27017, "test"));
        mongo.getDB("test").dropDatabase();
        mongo.close();

    }
}