MongoDB 2.4 - Java (field selection)

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();

Random random = new Random();

for (int i = 0; i < 10; i++) {
collection
.insert(new BasicDBObject("x", random.nextInt(2)).append(
"y", random.nextInt(100)).append("z",
random.nextInt(1000)));
}

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

show(query);

client.close();
}

private static void show(DBObject query) {
DBCursor result = null;

try {
result = collection.find(query, new BasicDBObject("x", false));

showResult(result);

result = collection.find(query, new BasicDBObject("y", true));

showResult(result);

result = collection.find(query,
new BasicDBObject("y", true).append("_id", false));

showResult(result);

} finally {
result.close();
}
}

private static void showResult(DBCursor result) {
while (result.hasNext()) {
DBObject document = result.next();

System.out.println(document);
}
}
}