Video: Oop puas muaj kev sib raug zoo?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Ib qho zoo ntawm Object-Oriented programming lus yog code rov siv dua. Khoom taw qhia programming feem ntau txhawb 4 hom kev sib raug zoo uas yog: qub txeeg qub teg, koom haum, muaj pes tsawg leeg thiab aggregation. Tag nrho cov no kev sib raug zoo yog raws li " yog ib" kev sib raug zoo , " muaj -ib" kev sib raug zoo thiab "ib feem ntawm" kev sib raug zoo.
Tsis tas li ntawd, kev sib raug zoo txawv ntawm kev sib raug zoo li cas?
Hauv OOP, YOG - Kev sib raug zoo yog qub txeeg qub teg. Qhov no txhais tau hais tias, cov menyuam kawm ntawv yog a hom niam txiv chav kawm. A HAS-A kev sib raug zoo yog dynamic (khiav sijhawm) khi thaum qub txeeg qub teg yog a static (compile time) khi. Yog tias koj tsuas yog xav rov siv cov cai thiab koj paub tias ob qho tib si tsis zoo siv cov khoom sib xyaw.
Ib yam li ntawd, puas yog kev sib raug zoo qub txeeg qub teg? Hauv Java, ib Yog -A kev sib raug zoo nyob ntawm qub txeeg qub teg . Ntxiv mus qub txeeg qub teg yog ntawm ob hom, chav kawm qub txeeg qub teg thiab interface qub txeeg qub teg . Nws yog siv rau code reusability hauv Java. Ib qho ntawm cov khoom ntawm qub txeeg qub teg yog uas qub txeeg qub teg yog unidirectional nyob rau hauv xwm.
Tsuas yog li ntawd, lub tswvyim OOP twg yog qhov kev sib raug zoo ntawm cov khoom?
Hauv object-oriented programming , cov lub tswvyim ntawm IS-A yog ib tug lig raws li Inheritance, uas yuav ua tau ntawm ob hom Class Inheritance lossis Interface Inheritance. Nws yog ib yam li hais tias "A yog ib hom B ntawm yam". Piv txwv li, Apple yog ib Txiv Hmab Txiv Ntoo, Tsheb yog Tsheb thiab lwm yam cuab yeej cuab tam yog ib-directional.
Puas muaj kev sib raug zoo VS muaj kev sib raug zoo hauv C#?
Kev sib xyaw yog lwm qhov tseem ceeb kev sib raug zoo ntaus hauv object-oriented programming. Ib tug muaj pes tsawg leeg kev sib raug zoo tshwm sim thaum ib yam khoom los ntawm ib chav kawm, yog tsim los ntawm los yog tsim los ntawm ib lossis ntau yam khoom los ntawm lwm chav kawm. Nws tseem hu ua " Muaj A "type kev sib raug zoo . Lub Order object kuj yog tsim los ntawm lwm yam khoom.
Pom zoo:
Kev sib cav sib ceg sib txawv li cas ntawm kev sib cav tsis zoo?
Txhua qhov kev sib cav tsis zoo siv txoj cai invalid inference. Yog tias qhov kev sib cav tsis zoo koj paub tias nws tsis siv. Kev siv tau txhais tau tias tsis muaj kev txhais lus qhov twg qhov chaw muaj tseeb thiab qhov kev txiav txim siab tuaj yeem tsis tseeb ib txhij. Yog tias qhov kev sib cav ua txhaum koj tuaj yeem tsis quav ntsej nws thiab sim nkag siab lub ntsiab lus tseem
Vim li cas kev sib raug zoo algebra siv nyob rau hauv kev sib raug zoo database tswj?
RELATIONAL ALGEBRA yog ib hom lus nug uas siv dav heev. Nws sau cov xwm txheej ntawm kev sib raug zoo raws li kev tawm tswv yim thiab muab qhov tshwm sim ntawm kev sib raug zoo raws li cov zis. Nws siv ntau yam haujlwm los ua qhov haujlwm no. Relational algebra operations yog ua recursively ntawm kev sib raug zoo
Dab tsi yog qhov txawv ntawm kev sib raug zoo unary kev sib raug zoo binary thiab kev sib raug zoo ternary?
Kev sib raug zoo tsis sib xws yog thaum ob tus neeg koom hauv kev sib raug zoo yog tib lub koom haum. Piv txwv li: Cov ncauj lus yuav yog qhov yuav tsum tau ua ua ntej rau lwm yam kev kawm. Kev sib raug zoo ternary yog thaum peb lub koom haum koom nrog kev sib raug zoo
Dab tsi yog qhov txawv ntawm kev sib raug zoo thiab tsis muaj kev sib raug zoo databases?
Qhov sib txawv loj ntawm lawv yog li cas lawv tuav cov ntaub ntawv. Relational databases are structured.Non-relational databases are document-oriented. Qhov no hu ua cov ntaub ntawv hom cia tso cai ntau 'qeb' ntawm cov ntaub ntawv khaws cia hauv ib qho kev tsim lossis Cov Ntaub Ntawv
Dab tsi yog qee qhov tsis zoo ntawm lub sijhawm stamping txoj hauv kev rau kev tswj hwm kev sib raug zoo?
Qhov tsis zoo ntawm lub sij hawm stamping mus kom ze yog tias txhua tus nqi khaws cia hauv cov ntaub ntawv yuav tsum muaj ob lub sij hawm thwj ntxiv: ib qho rau lub sijhawm kawg ntawm daim teb tau nyeem thiab ib qho rau qhov hloov tshiab kawg. Lub sij hawm stamping yog li ua rau kom nco xav tau thiab cov ntaub ntawv ua haujlwm nyiaj siv ua haujlwm