Video: Koj hu rau chav kawm li cas hauv Java?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Lub dot (.) yog siv los nkag rau qhov khoom tus cwj pwm thiab txoj hauv kev. Rau hu ib txoj hauv kev Java , sau tus txheej txheem npe ua raws li pawg ntawm kab lus (), tom qab los ntawm ib qho semicolon (;). A chav kawm yuav tsum muaj lub npe sib xws (Tsev thiab Tsheb.
Kuj paub, dab tsi yog chav kawm hauv Java?
Cov chav kawm thiab Objects hauv Java . Cov chav kawm thiab Objects yog cov ntsiab lus tseem ceeb ntawm Object Oriented Programming uas tig mus ncig lub neej tiag tiag. Chav kawm . A chav kawm yog ib tug neeg siv daim ntawv qhia los yog tus qauv los ntawm cov khoom uas raug tsim. Nws sawv cev rau cov txheej txheem lossis cov txheej txheem uas muaj rau txhua yam khoom ntawm ib qho
Tsis tas li ntawd, koj yuav tsim ib chav kawm hauv Java li cas? Tsim ib chav kawm Java lossis hom
- Hauv qhov project qhov rais, right-click a Java file or folder, and select New > Java Class.
- Hauv Create New Class dialog, sau rau hauv cov teb:
- Nyem OK.
Hais txog qhov no, hom kev kawm yog dab tsi?
A chav kawm txoj kev yog a txoj kev uas yog khi rau lub chav kawm thiab tsis yog khoom ntawm lub chav kawm . Lawv muaj kev nkag tau mus rau lub xeev ntawm lub chav kawm raws li nws siv a chav kawm parameter uas taw tes rau lub chav kawm thiab tsis yog qhov khoom piv txwv. Piv txwv li nws tuaj yeem hloov kho a chav kawm variable uas yuav siv tau rau txhua qhov piv txwv.
Oop tswvyim yog dab tsi?
OOP tswvyim hauv Java yog cov tswv yim tseem ceeb tom qab Java's Object Oriented Programming. Lawv yog ib qho abstraction, encapsulation, qub txeeg qub teg, thiab polymorphism. Qhov tseeb, Java OOP tswvyim cia peb tsim txoj hauv kev ua haujlwm thiab hloov pauv, tom qab ntawd rov siv tag nrho lossis ib feem ntawm lawv yam tsis muaj kev cuam tshuam kev nyab xeeb.
Pom zoo:
Dab tsi yog ob chav kawm tshwj xeeb hauv hierarchy ntawm Java zam chav kawm?
Chav Kawm Exception muaj ob lub ntsiab subclasses: IOException class thiab RuntimeException Class. Hauv qab no yog cov npe ntawm feem ntau kuaj xyuas thiab tsis tau txheeb xyuas Java's Built-in Exceptions
Peb puas tuaj yeem muaj ntau chav kawm pej xeem hauv chav kawm hauv Java?
Yog, nws ua tau. Txawm li cas los xij, muaj peev xwm tsuas yog ib pawg pej xeem ib. java cov ntaub ntawv, raws li publicclasses yuav tsum muaj tib lub npe raws li cov ntaub ntawv qhov chaw. OneJava cov ntaub ntawv tuaj yeem muaj ntau chav kawm nrog kev txwv uas tsuas yog ib qho ntawm lawv tuaj yeem ua pej xeem
Kuv puas tuaj yeem ntxiv cov tub ntxhais kawm rau hauv Google chav kawm?
Thaum tso npe rau koj cov tub ntxhais kawm, muaj peb txoj kev xaiv uas koj muaj: Sau npe Code, ntxiv los ntawm email, lossis importvia Google Classroom. Txhawm rau tso npe cov tub ntxhais kawm, xaiv chav kawm uas koj xav ntxiv rau ntawm nplooj ntawv tseem ceeb ntawm koj lub dashboard, tom qab ntawd nyem rau ntawm 'Cov Tub Ntxhais Kawm' tab. Thaum kawg, nyem Ntxiv Cov Tub Kawm Ntawv
Chav kawm piav qhia txog tus qauv ntawm chav kawm yog dab tsi?
Nyob rau hauv object-oriented programming, ib chav kawm yog ib tug template txhais ntawm txoj kev s thiab txawv txawv s nyob rau hauv ib tug tej yam khoom. Yog li, ib yam khoom yog ib qho piv txwv tshwj xeeb ntawm chav kawm; nws muaj cov txiaj ntsig tiag tiag tsis yog hloov pauv. Cov qauv ntawm ib chav kawm thiab nws cov subclasses yog hu ua chav kawm hierarchy
Dab tsi yog kev siv cov ntawv cim kev cai li cas koj nkag mus rau hauv Apex cov chav kawm thiab hauv Visualforce nplooj ntawv?
Cov ntawv sau kev cai tso cai rau cov neeg tsim khoom tsim cov ntawv thov ntau hom lus los ntawm kev nthuav qhia cov ntaub ntawv (piv txwv li, pab cov ntawv lossis cov lus yuam kev) hauv tus neeg siv hom lus. Cov ntawv sau kev cai yog cov ntawv sau muaj txiaj ntsig uas tuaj yeem nkag tau los ntawm Apex cov chav kawm, nplooj ntawv Visualforce, lossis cov khoom siv xob laim