Can we have multiple public classes in a Java source fileThe name of the java file must match the class namePublic class examplejava method教學Error no class declared in source file JavaPublic class in Java

what is the difference between `public class` and just `class`?

文章推薦指數： 80 %
投票人數：10人

public , protected and private are access modifiers. Public means that the subject may be ... Home Public Questions Tags Users Companies Collectives ExploreCollectives Teams StackOverflowforTeams –Startcollaboratingandsharingorganizationalknowledge. CreateafreeTeam WhyTeams? Teams CreatefreeTeam Collectives™onStackOverflow Findcentralized,trustedcontentandcollaboratearoundthetechnologiesyouusemost. LearnmoreaboutCollectives Teams Q&Aforwork Connectandshareknowledgewithinasinglelocationthatisstructuredandeasytosearch. LearnmoreaboutTeams whatisthedifferencebetween`publicclass`andjust`class`? AskQuestion Asked 9years,3monthsago Modified 26daysago Viewed 98ktimes 48 24 IhavenoticedthatifIdon'twritepublicbeforeaclassitworkssameaslikeapublicclass.Ican'tunderstandwhyso?ItshouldshowanerrorwhenIdon'tdeclareaclassaspublic,privateorprotected.Butitworksfine.Whatisthereason? javaclass Share Improvethisquestion Follow editedAug25at15:59 TusharMonirul askedMay27,2013at19:14 TusharMonirulTusharMonirul 4,76499goldbadges3737silverbadges4848bronzebadges 2 1 Thiswillprovideyouanadequateanswer. – Makoto May27,2013at19:17 Youcanreferthislink,providingthesameknowledge:stackoverflow.com/questions/614818/… – Deepak Jul26,2016at13:10 Addacomment  |  9Answers 9 Sortedby: Resettodefault Highestscore(default) Trending(recentvotescountmore) Datemodified(newestfirst) Datecreated(oldestfirst) 48 Ihavenoticedthatifdon'twritepublicbeforeaclassitsworkssameaslikeapublicclass. Noitdoesn't.Unlessit'spublic,theclasswon'tbevisibletoothercodewhichisn'tinthesamepackage.Thedefaultaccessibility(whichcan'tbespecifiedexplicitly)isthataclass(orothermember)isonlyvisibletoothercodewithinthesamepackage. YoushouldreadtheJavaLanguageSpecificationsection6.6andtheJavaTutorial(ControllingAccesstoMembersofaClass)formoredetails. Share Improvethisanswer Follow answeredMay27,2013at19:16 JonSkeetJonSkeet 1.4m832832goldbadges89788978silverbadges90889088bronzebadges Addacomment  |  42 public,protectedandprivateareaccessmodifiers.Publicmeansthatthesubjectmaybeaccessedbyanyclass,protectedbysubclass,privatebytheclassitself,nomodifiermeans"packageprotected",sothesubjectmaybeaccessedbyclassesfromthesamepackage. Subjectisclass,method,membervariable. Share Improvethisanswer Follow answeredMay27,2013at19:17 AlexRAlexR 113k1515goldbadges127127silverbadges204204bronzebadges 2 2 Ifthesubjectisa'top'levelclass,itcannnotbedeclaredaseitherprivateorprotected. – lupchiazoem Oct28,2018at1:46 Sothatwouldmeanthataprivateclasscanonlyeveroperatecompletelyindependently,right? – temporary_user_name Jan19,2019at1:10 Addacomment  |  9 Classesarepackageprivatebydefault(asoutlinedhere)soit'snotbehavingthesameway.Youjustthinkitisbecauseyouhaven'ttriedtoconsumeyourclassfromadifferentpackage. Share Improvethisanswer Follow answeredMay27,2013at19:17 EstebanArayaEstebanAraya 28.8k2323goldbadges105105silverbadges139139bronzebadges Addacomment  |  3 Theremustbeonlyonepublicclassper.javasourcefileandthenameofthefilemustmatchwiththispublicclass. SimilarquestionisaskedbeforeonSO.Pleasefindithere Share Improvethisanswer Follow editedMay23,2017at12:17 CommunityBot 111silverbadge answeredMay28,2013at6:28 AsadAsad 1,7971515silverbadges2323bronzebadges Addacomment  |  1 Itworksthesameonlybecauseyouareworkingwithjustprobablyonefileandinthesamepackage. Ifyouhavemorethanonepackagethenyouhavetheproblem.Theclassthatdoesn'thave"public"beforethenameofclasscannotbecreatedinanotherpackage.Youcannotuseitsconstructor.Youjustcannotaccessitoutsideofthepackagethattheclasswascreatedin. Share Improvethisanswer Follow answeredJul27,2015at18:31 MorfidonMorfidon 1,30911goldbadge1717silverbadges3131bronzebadges Addacomment  |  0 Fordeclarationsofclassesareavaibleonlytwokeywords: public.Example:publicclassStudent{//...} privatepackage(asdefault).Example:classNote{//...}.Itisvisibleonlyinhispackage. Youcanuseprivateandprotectedonlyifyoudeclareanmemberinsideofaclass. Example: publicclassStudent{ protectedNotenote; } Share Improvethisanswer Follow answeredMay27,2013at19:33 BlockedBlocked 32822goldbadges44silverbadges2020bronzebadges Addacomment  |  0 Ifyoudon'tgiveanaccessmodifierit'sbydefaultpackageprivateaccess.Theclassisnotaccessibleoutsideofthepackage.IdeallytheJLSshould'veincludedakeywordforpackageaccesstoavoidconfusionandunintendedconsequences. Somethinglike, defaultclassStudent{} Share Improvethisanswer Follow answeredMay27,2013at20:31 The_301The_301 85111goldbadge88silverbadges1313bronzebadges Addacomment  |  0 Noanormalclassandapublicclassdon'tworkthesame.Aclasswithoutaaccessmodifiersuchaspublicisautomaticallysettodefaultaccess.(No,youcan'tgivedefaultasaccessexplicitly).Ifyoucreateadefaultaccessclassinsideapackagethenthatclasscannotbeaccessedoutsidethatpackagebutpublicclasscanbeaccessedevenoutsidethatpackage Share Improvethisanswer Follow answeredMar28,2019at5:59 joejohnjoejohn 111bronzebadge Addacomment  |  0 AclassnotdeclaredwithanyaccessmodifierisautomaticallydeclaredasDEFAULTatruntime Withthesetheclassisaccessiblethatsamepackage Butnotanyotherpackage Share Improvethisanswer Follow answeredJan8,2021at10:33 AbdulrazaqAbdulrazaq 11 1 1 Whiletheanswerisnotincorrect,itdoesn'taddanyvaluetotheotheranswerspublishedhere. – AlBlue Jan8,2021at11:21 Addacomment  |  YourAnswer ThanksforcontributingananswertoStackOverflow!Pleasebesuretoanswerthequestion.Providedetailsandshareyourresearch!Butavoid…Askingforhelp,clarification,orrespondingtootheranswers.Makingstatementsbasedonopinion;backthemupwithreferencesorpersonalexperience.Tolearnmore,seeourtipsonwritinggreatanswers. Draftsaved Draftdiscarded Signuporlogin SignupusingGoogle SignupusingFacebook SignupusingEmailandPassword Submit Postasaguest Name Email Required,butnevershown PostYourAnswer Discard Byclicking“PostYourAnswer”,youagreetoourtermsofservice,privacypolicyandcookiepolicy Nottheansweryou'relookingfor?Browseotherquestionstaggedjavaclassoraskyourownquestion. TheOverflowBlog IspenttwoyearstryingtodowhatBackstagedoesforfree Aserialentrepreneurfinallyembracesopensource(Ep.486) FeaturedonMeta PlannedmaintenancescheduledforWednesday,21September,00:30-03:00UTC... RecentColorContrastChangesandAccessibilityUpdates Revieweroverboard!Orarequesttoimprovetheonboardingguidancefornew... ShouldIexplainotherpeople'scode-onlyanswers? Linked 3 What'sthedifferencebetweenpublicclassMainandclassMain? 782 InC#,whatisthedifferencebetweenpublic,private,protected,andhavingnoaccessmodifier? 5 TheuseofvisibilitymodifiersinJava 2 InnerclassvspublicinnerclassinJava Related 4190 WhatarethedifferencesbetweenaHashMapandaHashtableinJava? 2402 StaticclassvariablesandmethodsinPython 3535 Whatisthedifferencebetweenpublic,protected,package-privateandprivateinJava? 3321 WhatisaserialVersionUIDandwhyshouldIuseit? 1706 DifferencebetweenStringBuilderandStringBuffer 703 DoesPythonhave“private”variablesinclasses? 2443 What'sthedifferencebetween@Component,@Repository&@ServiceannotationsinSpring? 26615 Whyisprocessingasortedarrayfasterthanprocessinganunsortedarray? 1116 Whatisthedifferencebetweencanonicalname,simplenameandclassnameinJavaClass? 1758 Whatdoes"Couldnotfindorloadmainclass"mean? HotNetworkQuestions WhatdangersshouldIbeawareofwhendoingalong-distancebiketripthroughEurope? Howtosubtract1dayfromDateTimevalueinapex? TravellingtoNebraskaUSAfromtheUK.I’mstaying3weekswithafriend.Mybudgetissupertight:willIgetsenthome? Isitappropriatetobringaplayercharacterbackaftertheyhadbeen"killed"? Who/whataretheseentitiesinTronthatdon'tfollowthenormalpatternfor'Programs'? Iamlookingforaword(anounpreferablybutanadjectivewouldsuffice)thatdenotesapersonthatknowinglyallowsanothertousethemregularly Rolejustbelowroot? WhyDidOldSovietCityBikesHaveLongerFramesinGeneral Integrate[Sqrt[(1-Cos[t])/(Cos[a]-Cos[t])],{t,a,Pi},Assumptions->0

請為這篇文章評分？

延伸文章資訊