Mongo java

import java.net.UnknownHostException;
import java.util.List;
import java.util.Set;

import com.mongodb.BasicDBObject;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBCursor;
import com.mongodb.Mongo;

public class MainMongo {
    private Mongo conexion;
    private DB database;
    private DBCollection collection;

    /**
     * @param args
     * @throws UnknownHostException
     */
    public static void main(String[] args) throws UnknownHostException {
        // TODO Auto-generated method stub
        MainMongo ObjetoMongo = new MainMongo();
        ObjetoMongo.conexion("localhost");
        ObjetoMongo.colecciones();
        ObjetoMongo.insertar();
        ObjetoMongo.mostrarelementos();

    }

    private void conexion(String host) throws UnknownHostException {
        this.conexion = new Mongo(host);
        List<String> bases = conexion.getDatabaseNames();
        System.out.println("Bases de datos :");
        int i = 0;
        for (String b : bases) {
            System.out.println("Bases de datos "+i+" : "+b);
            i += 1;
        }

        System.out.println("Usando test");
        this.database = this.conexion.getDB( "test" );
    }
    private void colecciones() {
        Set<String> colls = this.database.getCollectionNames();
        System.out.println("Colecciones de "+this.database.getName().toString());
        for (String c : colls) {
            System.out.println(c);
        }
        this.collection = this.database.getCollection("test");
        System.out.println("Usando test");
    }
    private void mostrarelementos() {
        System.out.println("Todos los elementos :");
        DBCursor cursor = this.collection.find();
        try {
           while(cursor.hasNext()) {
               System.out.println(cursor.next());
           }
        } finally {
           cursor.close();
        }
    }

    private void insertar() {
        System.out.println("Insertando elementos");
        for (int i=0; i < 100; i++) {
            this.collection.insert(new BasicDBObject("Elemento : ", i);
        }
    }

}