Video: Dab tsi yog qhov pib tub nkeeg hauv Singleton?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Lazy Initialization yog ib txoj kev uas ib tug ncua lub kev xav ntawm ib yam khoom mus txog thaum nws thawj zaug siv. Hauv lwm lo lus, piv txwv ntawm chav kawm yog tsim thaum nws yuav tsum tau siv thawj zaug. Lub tswv yim tom qab no yog kom tsis txhob muaj qhov tsim piv txwv tsim nyog.
Ntawm no, dab tsi yog tub nkeeg pib pib hauv Java?
Lazy pib yog ib qho kev ua tau zoo. Nws yog siv thaum cov ntaub ntawv suav tias yog 'kim' rau qee qhov laj thawj. Piv txwv li: yog tias tus nqi hashCode rau ib yam khoom yuav tsis xav tau los ntawm nws tus neeg hu xov tooj, ib txwm suav tus hashCode rau txhua qhov ntawm cov khoom yuav xav tias tsis tsim nyog.
Ib tug kuj yuav nug, ua li cas koj rhuav ib singleton? Serialization yog siv los hloov cov khoom ntawm byte kwj thiab txuag hauv cov ntaub ntawv lossis xa hauv lub network. Piv txwv tias koj serialize ib yam khoom ntawm a singleton chav kawm. Tom qab ntawd yog tias koj de-serialize cov khoom ntawd nws yuav tsim ib qho piv txwv tshiab thiab li no tawg tus singleton qauv.
Yog li ntawd, dab tsi yog tub nkeeg thiab xav pib pib?
Lazy pib yog cov txheej txheem peb txwv cov khoom tsim kom txog thaum nws tsim los ntawm daim ntawv thov code. Hauv lwm txoj kev kev xav pib tsim cov khoom ua ntej thiab tsuas yog tom qab pib daim ntawv thov lossis module. Qhov no yuav pab tau yog tias cov khoom yuav tsum tau ua thiab hauv txhua qhov kev ua haujlwm.
Dab tsi yog kev siv cov chav kawm singleton?
Hauv Java Singleton qauv yuav xyuas kom meej tias tsuas muaj ib qho piv txwv ntawm ib chav kawm yog tsim nyob rau hauv Java Virtual Machine. Nws yog siv los muab lub ntiaj teb point ntawm kev nkag mus rau cov khoom. Nyob rau hauv cov nqe lus ntawm kev siv siv Singleton cov qauv yog siv hauv kev nkag, caches, xov pas dej, configuration settings, ntaus ntawv tsav tsheb khoom.
Pom zoo:
Dab tsi yog tub nkeeg instantiation hauv C #?
Lazy pib yog ib qho txheej txheem uas defers lub creation ntawm ib yam khoom mus txog rau thaum thawj zaug nws xav tau. Hauv lwm lo lus, pib ntawm qhov khoom tshwm sim tsuas yog ntawm kev thov
Koj ua li cas thaum ntxov thiab tub nkeeg pib ntawm ib qho khoom?
4 Teb. Zoo Lazy pib txhais tau tias koj tsis pib cov khoom kom txog rau thaum thawj zaug lawv siv. Kev pib ntxov ntxov tsuas yog thim rov qab, koj pib pib ib zaug ib zaug thaum lub sijhawm thauj khoom hauv chav kawm. Muaj ntau txoj hauv kev los ua qhov pib ntxov, ib qho yog los ntawm kev tshaj tawm koj tus singleton li zoo li qub
Dab tsi yog tub nkeeg hauv C#?
Lazy pib yog ib qho txheej txheem uas defers lub creation ntawm ib yam khoom mus txog rau thaum thawj zaug nws xav tau. Hauv lwm lo lus, pib ntawm qhov khoom tshwm sim tsuas yog ntawm kev thov. Nco ntsoov tias cov ntsiab lus tub nkeeg pib thiab tub nkeeg instantiation txhais tau tias tib yam - lawv tuaj yeem siv sib hloov
Yuav ua li cas tub nkeeg pib ua kom tiav net?
Lazy pib siv feem ntau yog siv los txhim kho kev ua tau zoo, zam kev xam khib nyiab, thiab txo cov kev xav tau ntawm kev nco. Los ntawm kev siv Lazy tshaj tawm cov khoom Orders rau tub nkeeg pib, koj tuaj yeem zam kev siv cov khoom siv thaum tsis siv khoom
Vim li cas qhov kev kawm ua piv txwv hu ua tub nkeeg kawm?
Kev kawm raws li piv txwv suav nrog cov neeg nyob ze ze tshaj plaws, qhov ntsuas qhov hnyav hauv zos thiab cov txheej txheem kev xav raws li qhov xwm txheej. Cov txheej txheem ua piv txwv qee zaum hu ua tub nkeeg txoj kev kawm vim tias lawv ncua kev ua haujlwm kom txog rau thaum qhov xwm txheej tshiab yuav tsum tau muab cais tawm