Java interface and implementation naming (or “I” or “Impl”)

Posted on by

How do I name my interfaces and the classes that implement my interfaces? Through much research on the internet and my own gut feelings, this is what I reckon:

I never prefix my interfaces with “I”. The value of coding to interfaces is that you can swap out the implementation with minimal hassle. It means that instead of using implementation specific class names in your code, you use interface names instead – right? So, if I’m going to be using interface names everywhere, I don’t want to have to prefix everything with “I”. Coding to interfaces is a best practice, so I don’t need to explicitly state that I am doing it…It should just happen – which makes the “I” prefix redundant.

Furthermore, the “Impl” suffix is also redundant. Yes, indeed, your dilemma isn’t as simple as picking between the two. Firstly, “Impl” doesn’t translate. “Impl” in other languages has no meaning, and yes I’m talking about Polish and Scala. In Polish (according to Google translate), “implementation” is “realizacja” and in Scala, there are no interfaces. The closest thing Scala has to interfaces is traits, which can contain implementation specific code. So really, everything is Scala is an implementation, so why you use “Impl” suffix?

Secondly “Impl” is restrictive. What happens when you want to add another implementation of Foo? You gonna call it “FooImplImpl”? “AnotherFooImpl”? “FooImpl2″? I didn’t think so. Perhaps you were going to just call it “FooImpl” and put it in a different package…

Thirdly “Impl” doesn’t convey any meaning about what the implementation is. You wouldn’t create an “AnimalImpl” would you? You’d create a “Lion” or an “Elephant”. There is almost always something that distinguishes your implementation that you can use in the class name. Even if it is a long name, it doesn’t matter – you’re coding to interfaces (remember?), so you’re rarely going to see that class name.

Lastly, and probably most importantly – you still can’t think of a name? You don’t need an interface. If you really can’t think of a name, your class must be generic enough to not need an interface and you’re probably not going to have any other implementations. Your class methods become the interface contract, and that is that.

3,227 thoughts on “Java interface and implementation naming (or “I” or “Impl”)”

  8. Sports betting has become one of the most popular ways for fans to add extra excitement to major sporting events. Modern online betting platforms and every established bookmaker offer markets across football tennis basketball boxing MMA and many other sports. Players can compare odds check the latest betting odds and explore live betting markets while matches are taking place. Finding the best betting odds can also make a significant difference when comparing different bookies and betting sites. sportwins casino tournament extra spins Football betting and soccer betting remain particularly popular with markets available for domestic leagues and international competitions. Fans regularly search for Premier League betting Champions League betting and World Cup betting including Premier League betting odds today Champions League betting tips today and World Cup betting odds online. For UK players searches such as best football betting sites UK can help identify online bookmakers offering competitive markets useful statistics and in-play options. mma betting There is also a huge selection outside football. Popular categories include NFL betting NBA betting MLB betting tennis betting basketball betting UFC betting MMA betting boxing betting golf betting cricket betting horse racing betting and esports betting. Users may compare NFL betting odds and lines look at NBA betting odds for tonight research tennis betting odds and tips find the best horse racing betting sites or explore esports betting sites real money depending on the sport they follow. what is a nominated slots free spins offer Online bookmakers provide many different bet types including moneyline spreads betting parlay betting and same game parlay markets. A bettor looking for several selections in one wager might compare same game parlay betting sites while fans following an event in real time may prefer live sports betting odds online or the best in play betting sites. Some online bookmakers with live streaming also combine betting markets with access to selected live sporting events. darinplay my free spins offer card Convenience is another major part of modern online sports betting. Many betting sites now provide dedicated sports betting apps for Android and mobile sports betting apps iOS allowing users to follow markets from a phone or tablet. Comparing the best online sports betting sites best betting sites and online bookmakers can help users evaluate available sports betting markets mobile features and odds before choosing a platform. in play both teams to score betting Promotions are another feature commonly associated with online betting platforms. Depending on the bookmaker and location offers may include a betting bonus free bet welcome bonus betting betting promo code or no deposit free bet promotion. Terms eligibility and wagering requirements can vary significantly so promotional conditions should always be checked carefully. Whether someone is researching betting tips comparing bookies or searching for competitive odds choosing a licensed and reputable betting service and gambling responsibly should remain the priority. https://darinplay.com/ minimum deposit casino one dollar slots

  9. Купить наркотики москва Купить Бошки Шишки Мефедрон Кокаин

  17. Где купить альфа пвп Купить Бошки Шишки Мефедрон Кокаин

  18. kasyno online automaty ice casino bonus bez depozytu 2026

  23. Где купить наркотики Купить Бошки Шишки Мефедрон Кокаин

  25. najbardziej wypЕ‚acalne kasyno online nowe kasyna bonus bez depozytu

  26. Купить марихуана гашиш бошки Купить Бошки Шишки Мефедрон Кокаин

  28. kasyno online automaty total casino usuniД™cie konta

  29. Whhere iss podn star desi foxxAsian teen tuybe vidosBobby gay pornEvva longoris seex videoCuum
    forr teensNiih eldeerly sex reportSexx wityh myy best friends gir friendGoldfish rubbbing alog tthe bottomWife lickos asss storiesMiilf lace
    underwearJordan kingzley pornstar pileFrree dominatrix
    seex pornDr frank ryn breast augmentation costPercentage oof womjen who’ve haad same sexx
    experiencesMaroa grazia ifalian nudeGirs iin cntrol
    oof cocksMaaya anal baseball batShemale titfy sexSiini doble penetrationTeen dru rehabBeggs hiim too cumHalff asoan hlf irishSex offenders inn alaskaPhots
    oof sexyy gorgeous liuckable clitsConvice wifee shve pussyCoons off uncircumcised penisMobby dicxk
    stampAmaeur ssex vbulletin videoStrap onn lesbian loveGaay teen yong boysPefer noorth
    cmshot compilation frde downloadCongenitfal peis malfoprmations picsWhats a
    cock ringNures drawkngs 50New yirk yanke sexx scandalAdultt fantsy playTeeen grohp icee breakersTreatment ffor
    fackal eborrheic dematitisWttch hoow too fuckFrree nud tong modelVintge orchestra phoo
    https://colmektube.cc/kanal/colmek-dildo Porrn starfs partyTruue
    ottom lineSexyy omen amatuersMatgure ladies wirh biig breastsErotic hhindi stories iin pdfFreee sexx xxx viddo sitesFuck their girlfriendSexyy asjan teaseOffshopre fishing cllub virrgin isalndsHiliter strip clubLesbians aand white dildoNeww year eve onn the stripSemale couple
    moviesAsian haveBamm marges dickAsian exy yogaa videoBrrother aand
    sistfer sexual partnersNudist family storiesFreee sexx parks hiltonMilff inn
    gartters tgpEuropean adult sexx modelsVitakins tto prevenbt breast cancerRuush linddbaum gayCosplasy fuckingJessxica simpson seex gamesGiirl beiing fforced tto
    cumRuubenesque nudeCollege fck fest wisconsinMaturte sedcing boyFemmme nuee amateurJanet jckson sex galleriesLindseyy dawwn mckenzie cumsholt vidsProstrate
    orhasm pornJason andrews porn starPictures younng men seduce milfsOlers
    edmopnton fanms party camks nue titsForcced tto mastewrbate cuum memm cfnmStrwp onn dildo funQueer but fuckFacial hand free movie gallerySexx dunedinAsiqn single ladyJacey’s assRero ancient anwl galleryCoujld i
    bbe ggay quizClikps hairyCouples taake turns fuckingAngel fre
    nnaked picHmemade latina milf porn18 aand abuswd
    orn hubTitts porn mleg freeHomemade nude videosPutt myy penis

  31. Купить наркотики москва Купить Бошки Шишки Мефедрон Кокаин

  32. kasyno z wplata paysafecard bukmacherzy w polsce

  36. Players who like casino games of a different flavour will not be left disappointed with the selection on offer at GoWild. There are many different types of blackjack games such as Spanish 21 Double Exposure Blackjack and an Atlantic City variation. There are also several versions of roulette as well as baccarat craps and poker-based games including Cyberstud Poker Pai Gow and 3 Card Poker. casino review

  37. BitSpins Casinos bonus library is crammed full of exciting bonuses and heart stealing offers. These are available on a daily weekly and monthly basis for the players to sweep off boredom of their daily lives. Starting from an exciting sign up bonus to daily remunerative promotions this casino leaves no effort spared to maximise the winning opportunities of the players. mobile-friendly casino

  38. Купить лирику без рецепта Купить Бошки Шишки Мефедрон Кокаин

  41. CasinoXVNP.com is the Best Online Casino Guide for Players from English Speaking Countries. North America Canada Europe Australia South Africa & India can access over 20.000 Free games. On this page we will give you everything you need to know and more about how and where to play real money casino games online. Find the Best Online Casino USA on CasinoXVNP.COM live casino experience

  43. kasyno online automaty ggbet kasyno bonus bez depozytu

  44. Купить мефедрон бошки Купить Бошки Шишки Мефедрон Кокаин

  46. gry na prawdziwe pieniД…dze f1 casino no deposit bonus

  47. Соль меф купить Купить Бошки Шишки Мефедрон Кокаин

Leave a Reply

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>