Cov txheej txheem:
Video: Yuav ua li cas peb yuav ua kom cov chav kawm tsis hloov hauv Java nrog hnub tim?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2024-01-18 08:24
Peb yuav nkag siab tias cov lus qhia no txhais tau li cas los ntawm kev tsim cov chav kawm tsis hloov nrog cov khoom sib hloov nrog Hnub tim
- Tsis txhob muab "setter" txoj kev - txoj kev uas hloov teb los yog khoom xa mus los ntawm teb .
- Ua tag nrho teb zaum kawg thiab ntiag tug.
- Tsis txhob tso cai rau subclasses override txoj kev.
Ntawm no, peb yuav ua li cas thiaj ua tau ib chav kawm tsis hloov hauv Java?
Immutable Class hauv Java
- Tshaj tawm cov chav kawm kawg kom nws tsis tuaj yeem txuas ntxiv.
- Ua kom txhua qhov chaw ntiag tug kom tsis pub nkag ncaj qha.
- Tsis txhob muab cov txheej txheem setter rau variables.
- Ua kom tag nrho cov kev hloov pauv tau kawg kom nws tus nqi tuaj yeem raug muab rau ib zaug xwb.
- Pib pib tag nrho cov teb ntawm tus tsim qauv ua cov ntawv sib sib zog nqus.
Tom qab ntawd, lo lus nug yog, dab tsi yog kev siv cov chav kawm tsis hloov hauv Java? Chav kawm tsis hloov tau txhais tau hais tias ib zaug ib yam khoom raug tsim, peb hloov tsis tau nws cov ntsiab lus. Hauv Java , tag nrho cov wrapper chav kawm (xws li Integer, Boolean, Byte, Luv) thiab hlua chav kawm yog hloov tsis tau . Peb tuaj yeem tsim peb tus kheej chav kawm tsis hloov tau ib yam nkaus.
Cov neeg kuj nug, yog hnub kawm tsis hloov hauv Java?
Hnub tim tsis yog hloov tsis tau , peb yuav tsum tau ua ib daim ntawv tiv thaiv ntawm java ua . siv. Hnub tim teb thaum xa rov qab siv rau qhov piv txwv no hloov pauv. Cia peb tsim ib tug neeg hypothetical chav kawm uas muaj npe thiab dob tsuas yog ob tug tswv cuab xwb.
Yuav ua li cas peb thiaj ua tau ib yam khoom hloov tsis tau?
Txhawm rau ua kom cov khoom tsis hloov pauv, Koj yuav tsum ua cov kauj ruam no:
- Tsis txhob siv ib txoj hauv kev, uas tuaj yeem hloov chaw ntawm koj chav kawm. Piv txwv li tsis txhob siv Setters.
- Tsis txhob siv cov pej xeem uas tsis yog qhov kawg. Yog tias koj daim teb yog pej xeem ces koj yuav tsum tshaj tawm lawv li qhov kawg thiab pib lawv hauv tus tsim lossis ncaj qha hauv kab lus tshaj tawm.
Pom zoo:
Peb puas tuaj yeem txuas ntxiv cov chav kawm pov tseg hauv Java?
Tag nrho cov khoom nyob rau hauv Java zam chav kawm hierarchy txuas ntxiv los ntawm Throwable superclass. Tsuas yog cov piv txwv ntawm Throwable (los yog ib qho khoom qub txeeg qub teg) raug cuam tshuam ncaj qha los ntawm Java Virtual Machine (JVM), lossis tuaj yeem cuam tshuam ncaj qha los ntawm cov lus pov tseg
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
Vim li cas peb thiaj xav tau cov txheej txheem hauv chav kawm hauv Python?
Ib qho haujlwm uas tau teev tseg hauv chav kawm yog hu ua 'txoj kev'. Cov txheej txheem muaj kev nkag mus rau tag nrho cov ntaub ntawv uas muaj nyob rau hauv qhov piv txwv ntawm cov khoom; lawv tuaj yeem nkag mus thiab hloov kho txhua yam uas tau teev tseg yav dhau los ntawm tus kheej. Vim lawv siv tus kheej, lawv xav tau ib qho piv txwv ntawm chav kawm thiaj li yuav siv tau
Vim li cas cov ntsiav tshuaj yuav tsum tsis txhob hloov cov phau ntawv hauv chav kawm?
Cov tub ntxhais kawm ntawv uas nyeem cov ntawv luam tawm los ntawm cov ntawv nyeem nkag siab thiab khaws cov ntaub ntawv zoo dua li nyeem tawm ntawm lub ntsiav tshuaj. Lub koom haum American Optometric hais tias cov cuab yeej tuav tes tuaj yeem ua rau Computer Vision Syndrome ua rau qhov muag tsis pom kev, tsis pom kev thiab txawm tias mob migraines