Dab tsi yog pob tshaj tawm hauv Java?
Dab tsi yog pob tshaj tawm hauv Java?

Video: Dab tsi yog pob tshaj tawm hauv Java?

Video: Dab tsi yog pob tshaj tawm hauv Java?
Video: XENGYANG - NWS YOG DAB TSIS (WHAT'S MEANS) [Official Music Video] 2024, Kaum ib hlis
Anonim

pob ntawv tshaj tawm . Qhov import tshaj tawm tuaj yeem siv los ua kom tag nrho pob , lossis cov chav kawm ib leeg hauv ib pob , yooj yim dua rau koj Java qhov kev pab cuam. Yog tsis muaj pob ntawv tshaj tawm yog teev nyob rau hauv ib cov ntaub ntawv, lub "default pob "yog siv. Lub neej ntawd pob tsis tuaj yeem raug import los ntawm lwm tus pob khoom.

Ua li no, ua li cas koj tshaj tawm ib pob?

Rau tsim ib pob , koj xaiv lub npe rau lub pob (Lub npe cov rooj sib tham tau tham hauv ntu tom ntej) thiab muab a pob nqe lus nrog lub npe ntawd nyob rau saum toj ntawm txhua qhov chaw cov ntaub ntawv uas muaj cov hom (chav kawm, interfaces, enumerations, thiab annotation hom) uas koj xav kom suav nrog hauv pob.

Kuj Paub, pob txhais li cas hauv Java? A pob yog lub namespace uas npaj ib pawg ntawm cov chav kawm muaj feem xyuam thiab interfaces. Vim hais tias software sau nyob rau hauv lub Java programming lus tuaj yeem tsim los ntawm ntau pua lossis ntau txhiab tus ntawm cov chav kawm ib leeg, nws ua rau kev nkag siab zoo kom khaws cov khoom sib koom ua ke los ntawm kev tso cov chav kawm cuam tshuam thiab cuam tshuam rau hauv pob khoom.

Ib yam li ntawd, koj tuaj yeem nug, dab tsi yog pob hauv Java nrog piv txwv?

Pob hauv Java yog ib tug mechanism los encapsulate ib pawg ntawm cov chav kawm, sub pob khoom thiab interfaces. Pob ntawv yog siv rau: Tiv thaiv kev tsis sib haum ntawm lub npe. Rau piv txwv tuaj yeem muaj ob chav kawm nrog lub npe Cov Neeg Ua Haujlwm hauv ob pob khoom , kawm ntawv qib siab.

Vim li cas peb thiaj siv pob khoom hauv Java?

Pob ntawv yog siv rau hauv Java txhawm rau tiv thaiv kev tsis sib haum xeeb ntawm lub npe, tswj kev nkag mus, ua rau kev tshawb nrhiav / nrhiav thiab siv cov chav kawm, kev sib tshuam, kev suav sau thiab cov lus piav qhia yooj yim dua, thiab lwm yam.

Pom zoo: