Video: Dab tsi yog chav kawm txhais hauv Java?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
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 tus neeg siv txhais blueprint los yog prototype los ntawm cov khoom tsim. Nws sawv cev rau cov txheej txheem lossis cov txheej txheem uas muaj rau txhua yam khoom ntawm ib qho
Ib yam li ntawd, nws raug nug, dab tsi yog chav kawm txhais hauv programming?
Nyob rau hauv object-oriented programming , a chav kawm yog ib daim ntawv qhia txog kev tsim cov khoom (cov qauv ntaub ntawv tshwj xeeb), muab thawj qhov tseem ceeb rau lub xeev (cov tswvcuab sib txawv lossis cov cwj pwm), thiab kev siv tus cwj pwm (cov tswvcuab ua haujlwm lossis cov txheej txheem). Tus neeg siv- txhais cov khoom raug tsim los siv cov chav kawm lo lus tseem ceeb.
Ib sab saum toj, dab tsi yog chav kawm thiab khoom siv? A chav kawm yog ib daim phiaj los yog cov qauv uas txhais cov kev sib txawv thiab cov txheej txheem (functions) uas muaj rau txhua tus khoom ntawm ib yam. Ib khoom yog ib qho piv txwv ntawm a chav kawm . Software khoom feem ntau siv los ua qauv hauv ntiaj teb tiag khoom koj pom hauv lub neej txhua hnub.
Ib yam li ntawd, nws raug nug, dab tsi yog chav kawm piav nrog piv txwv?
Lus txhais: A chav kawm yog ib daim ntawv qhia uas txhais cov kev hloov pauv thiab cov txheej txheem uas muaj rau txhua yam khoom ntawm ib yam. Cov chav kawm rau peb lub tsheb kauj vab piv txwv yuav tshaj tawm cov piv txwv sib txawv uas tsim nyog kom muaj cov iav tam sim no, qhov kev sib tw tam sim no, thiab lwm yam, rau txhua lub tsheb kauj vab.
Vim li cas peb thiaj siv chav kawm hauv Java?
Vim li cas Cov chav kawm Tseem ceeb & Siv Tau Cov yam ntxwv ntawm ib qho khoom yog cov hloov pauv uas tuav cov ntaub ntawv, lossis cov ntaub ntawv, txog cov khoom thaum nws txoj hauv kev yog txoj hauv kev uas cov khoom tuaj yeem tswj hwm nws cov ntaub ntawv los tsim cov ntaub ntawv tshiab. A chav kawm hauv Java tsuas yog ib qho qauv tsim cov khoom uas muaj cov cwj pwm zoo sib xws thiab tus cwj pwm.
Pom zoo:
Dab tsi yog qhov txawv ntawm chav kawm sab hauv thiab cov chav nested?
Cov chav kawm uas tau tshaj tawm yam tsis siv qhov zoo li qub yog hu ua chav kawm sab hauv lossis chav kawm tsis zoo li qub. Cov chav kawm Staticnested yog chav kawm zoo li lwm cov tswv cuab zoo li qub ntawm cov chav kawm sab nrauv. Txawm li cas los xij, cov chav kawm sab hauv yog khi toinstance thiab nws tuaj yeem nkag mus rau cov tswv cuab ntawm pawg enclosingclass
Dab tsi yog txheej txheem ntawm kev txhais ob lossis ntau txoj hauv kev hauv tib chav kawm uas muaj tib lub npe tab sis sib txawv tsis tshaj tawm?
Method overloading Tus kos npe ntawm ib txoj kev tsis suav nrog nws cov khoom xa rov qab los yog nws qhov kev pom los yog qhov kev zam uas nws yuav pov. Kev xyaum ntawm kev txhais ob lossis ntau txoj hauv kev hauv tib chav kawm uas qhia tib lub npe tab sis muaj qhov sib txawv yog hu ua cov txheej txheem overloading
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
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