MongoDB 2.4 - Java (query criteria)

import java.net.UnknownHostException;
import java.util.Random;

import com.mongodb.BasicDBObject;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBCursor;
import com.mongodb.DBObject;
import com.mongodb.MongoClient;
import com.mongodb.QueryBuilder;
import com.mongodb.ServerAddress;

public class MongoDB {

private static DBCollection collection;

public static void main(String[] args) throws UnknownHostException {
MongoClient client = new MongoClient(new ServerAddress("localhost",
27017));
DB database = client.getDB("databaseName");
collection = database.getCollection("collectionName");

collection.drop();

for (int i = 0; i < 10; i++) {
collection.insert(new BasicDBObject("x", new Random().nextInt(2))
.append("y", new Random().nextInt(100)));
}

DBObject query = new BasicDBObject("x", 0);

show(query);

query = new BasicDBObject("x", 0).append("y", new BasicDBObject("$gt",
10).append("$lt", 90));

show(query);

QueryBuilder queryBuilder = QueryBuilder.start("x").is(0).and("y")
.greaterThan(10).lessThan(90);

show(queryBuilder.get());

client.close();
}

private static void show(DBObject query) {
showCount(query);
showFind(query);
}

private static void showCount(DBObject query) {
long count = collection.count(query);

System.out.println(count);
}

private static void showFind(DBObject query) {
DBCursor find = collection.find(query);

try {
while (find.hasNext()) {
DBObject document = find.next();

System.out.println(document);
}
} finally {
find.close();
}
}
}