Hoy el tema que nos ocupa es uno sencillo, pero que no debe pasarse por alto, por ser estas clases unas de las más usadas, dado su sencillo funcionamiento.
En primer lugar, vamos a inicializar un array de String, que como sabéis tiene longitud fija, lo que es un pequeño inconveniente a la hora de trabajar con algunos conjuntos de elementos. Para solucionar este problema, tenemos otras clases llamadas colecciones.
Dos de ellas son ArrayList y Vector. Un ArrayList es una implementación de la clase List, que es una colección que admite elementos duplicados y nulos, así como acceso por índice y otros métodos para trabajar con sus elementos. Vector también hereda de List es muy similar a ArrayList, con la diferencia de que la clase Vector es segura para trabajar con hilos (sincronizada). Esta ventaja penaliza ligeramente el rendimiento del Vector.
Antes de mostrar un ejemplo, añadir que a partir de la versión 1.6 1.5 de Java, si no me equivoco (me equivoqué :P), se introdujeron las colecciones genéricas, que suponen una ventaja en cuanto a que soportan comprobación de tipos en tiempo de compilación. Para definir el tipo de la colección simplemente se añade el tipo del objeto entre los símbolos '<' y '>' (ej.: Vector<String>).
A continuación, un sencillo ejemplo de uso de estas clases.
Hola!!
Muchas gracias por la info!! sólo decirte que las colecciones genéricas se introdujeron en la versión 1.5 de java.
Un saludo,
Nuria
Gracias Nuria!! ahora lo corrijo. Lo puse para ver si alguien se daba cuenta, jeje ;)
Un saludo!
tengo un problemilla con el que creo que me podeis ayudar. tengo un random y quiero asignarlo a un array, pero no lo consigo. Alguna idea?
package feedback;
import java.util.HashSet;
/**
*
* @author Pere
*/
public class primitiva {
public static void main(String args[]) {
HashSet t=new HashSet();
while (t.size()<9) {
Integer al=new Integer(10 + new java.util.Random().nextInt(91));
t.add(al);
}
java.util.List lista=new java.util.ArrayList(t);
java.util.Collections.sort(lista);
// Se muestran los resultados
java.util.Iterator it=lista.iterator();
while (it.hasNext()) {
System.out.println((Integer)it.next());
}
String []strArray = new String[9];
ListArray.toArray(strArray);
}
}
World's Best Neck Massager Get it Now 50% OFF + Free Shipping!
Wellness Enthusiasts! There has never been a better time to take care of your neck pain!
Our clinical-grade TENS technology will ensure you have neck relief in as little as 20 minutes.
Get Yours: https://hineck.co
The Best,
Shirleen
Utilización básica de arrays, ArrayList y Vector. Conversión de arrays. | Java-Spain.com
Hello
Looking to improve your posture and live a healthier life? Our Medico Postura™ Body Posture Corrector is here to help!
Experience instant posture improvement with Medico Postura™. This easy-to-use device can be worn anywhere, anytime – at home, work, or even while you sleep.
Made from lightweight, breathable fabric, it ensures comfort all day long.
Grab it today at a fantastic 60% OFF: https://medicopostura.com
Plus, enjoy FREE shipping for today only!
Don't miss out on this amazing deal. Get yours now and start transforming your posture!
Kind Regards,
Junko
Good day,
I hope you're doing well. I wanted to let you know about our new BANGE backpacks and sling bags that just released.
The bags are waterproof and anti-theft, and have a built-in USB cable that can recharge your phone while you're on the go.
Both bags are made of durable and high-quality materials, and are perfect for everyday use or travel.
Order yours now at 50% OFF with FREE Shipping: http://bangeshop.com
Cheers,
Rosalie
Hey there,
If you are one of the sufferers of the common problems nails have, then you are in luck! Our Toenail Clippers is here to help. It has a specially designed clip that can help those with troubles with winding nails, hard nails, two nails, nail cracks, deep nails, and thickened nails.
We are confident that our Toenail Clippers will provide you with the results you are looking for.
Get yours today with 60% OFF: https://podiatristusa.sale
Best,
Katharina
Get The Worlds Greatest Magic Sand Free Beach Mat!
Watch sand, dirt & dust disappear right before your eyes! It's perfect for beach, picnic, camping or hiking.
Act Now And Receive A Special Discount For Our Magic Mat!
Get Yours Here: https://magicmats.co
Have a great time,
Elsie
Good day
I wanted to reach out and let you know about our new dog harness. It's really easy to put on and take off - in just 2 seconds - and it's personalized for each dog.
Plus, we offer a lifetime warranty so you can be sure your pet is always safe and stylish.
We've had a lot of success with it so far and I think your dog would love it.
Get yours today with 50% OFF: https://caredogbest.com
FREE Shipping - TODAY ONLY!
To your success,
Hung
Hi
Defrost frozen foods in minutes safely and naturally with our THAW KING™.
50% OFF for the next 24 Hours ONLY + FREE Worldwide Shipping for a LIMITED time.
Buy now: https://thawking.co
Best regards,
Robyn
New Multifunction Waterproof Backpack
The best ever SUPER Backpack: Drop-proof/Scratch-resistant/USB Charging/Large capacity storage
50% OFF for the next 24 Hours ONLY + FREE Worldwide Shipping for a LIMITED time
Buy now: https://thebackpack.co
Have a great time,
Lilian
Hey there
Looking to improve your posture and live a healthier life? Our Medico Postura™ Body Posture Corrector is here to help!
Experience instant posture improvement with Medico Postura™. This easy-to-use device can be worn anywhere, anytime – at home, work, or even while you sleep.
Made from lightweight, breathable fabric, it ensures comfort all day long.
Grab it today at a fantastic 60% OFF: https://medicopostura.com
Plus, enjoy FREE shipping for today only!
Don't miss out on this amazing deal. Get yours now and start transforming your posture!
Cheers,
Delphia
Submit your new website to our directory and reach a wider audience. http://freeurlsubmission.rt32.xyz
am i ever going to get any support here? i'm going to just file a chargeback if you can't get back to me... you guys are listed as support on this amazon listing https://amzn.to/46pmr71 - please get back to me asap... -Steve
Looking to enhance your website's reach? I'm here to help! I'll personally blast your classified ads on 2,000+ high-traffic pages in the US and Canada, 500+ blogs, and 150+ social sites. My manual submission service ensures your ads land in the perfect places. Monitor and adjust your ad for maximum impact. Let's get your message out there, reach a wider audience, and boost your website's SEO together!
For details, shoot me an email or Skype me at my contact info below.
P. Stewart
Skype: live:.cid.f2bf75b5a952541b
Email: [email protected]
HMTs were defined as selective estrogen receptor modulators, estrogen receptor antagonists, and aromatase inhibitors can i buy viagra connect over the counter
Hi,
If I could generate leads on a performance basis for you, would you be interested in speaking?
Best regards,
Marcus Wenander
Co-founder @ Quality Leads
[email protected]
www.quality-leads.com
P.S. We recently helped seodr. (SEO Agency) to get 15+ new clients in less than six months.
Are you looking for a way to watch your favorite TV channels and movies on any device, anytime, anywhere? Look no further than OneTVIPTV.com , the best and most affordable IPTV service in the world (plans as low as $9/mnth) . With over 97,000 live TV channels and VOD, you will never run out of entertainment options. Sign up now and get a free trial for 24 hours. Don't miss this opportunity to enjoy the ultimate IPTV experience with OneTV IPTV. Go to Onetviptv.com
Забота о жилище - это забота о благополучии. Тепловая обработка фасадов - это не только изысканный облик, но и обеспечение теплового комфорта в вашем уютном уголке. Специалисты, наши мастера, предлагаем вам превратить ваш дом в идеальное жилище.
Наши проекты - это не просто тепловая обработка, это художественная работа с каждым элементом. Мы предпочитаем гармонии между визуальным восприятием и практической целесообразностью, чтобы ваш уголок стал не только пригодным для жизни, но и шикарным.
И самое важное - разумная цена! Мы верим, что профессиональные услуги не должны быть дорогим удовольствием. Стоимость утепления фасада дома под ключ начинается всего начиная с 1250 рублей за квадрат.
Современные технологии и качественные материалы позволяют нам создавать утепление, которое долговечно и надежно. Оставьте в прошлом холодные стены и лишние затраты на отопление - наше утепление станет вашим надежным препятствием перед холодом.
Подробнее на http://www.ppu-prof.ru/
Не откладывайте на потом заботу о удобстве в вашем жилище. Обращайтесь к экспертам, и ваш дом превратится настоящим художественным произведением, которое дарит тепло и радость. Вместе мы создадим дом, в котором вам будет по-настоящему удобно!
Seeking a trusted CPA for financial assurance and precise reporting? Explore our top-notch services, including expert financial statement audits, streamlined reviews, and comprehensive tax solutions. Elevate your financial game with San Diego CPA - where expertise meets tailored excellence. For a free consultation today, contact me directly or visit my site below.
Best regards,
Michelle Encines, Manager
San Diego, CPA A Professional Tax and Accountancy Corporation
Professional Advice. Sharper Results.
5703 Oberlin Drive Suite 107
San Diego, CA 92121
(858)246-6519 Office
(866)272-8296 Toll free
(858)800-3888 fax
www.sandiegocpas.com
Brand new tech is changing the way companies market. It turns Youtube videos into interactive games keeping the viewers attention. Companies reward people for watching the whole video and create a marketing frenzy like Black Friday.
As seen on CBS, NBC, FOX, and ABC.
Drop me a line via email/skype below to see if you qualify for a free GAMIFICATION of your video.
Julien
email: [email protected]
skype: live:.cid.d347be37995c0a8d
Earn up to $60,000 USD as a 4U2 Inc. Independent Contractor Agent! We're seeking individuals worldwide with computer access, fluent English communication skills, and a desire to save time and money for suppliers, buyers, and salespersons in our E-Commerce Marketplace. Join our mission to "Save Suppliers, Buyers, and Salespersons Time, Money, and make Money!" Contact us at [email protected] for more info..
Enviar un comentario nuevo