Video: Yog vim li cas immutability zoo?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Ib hloov tsis tau khoom yog ib qho uas nws lub xeev tsis tuaj yeem thiab yuav tsis hloov tom qab nws pib tsim. Hloov tsis tau cov khoom yog zoo heev , feem ntau vim lawv yog Thread zoo (thiab threaded code yuav tsum tau zam kom ntau li ntau tau). Koj tuaj yeem hla lawv ib ncig yam tsis ntshai lawv yuav raug hloov.
Ib yam li ntawd, vim li cas qhov kev hloov pauv tseem ceeb heev?
Dhau li txo kev siv lub cim xeeb, kev hloov tsis tau tso cai rau koj los txhim kho koj daim ntawv thov los ntawm kev siv cov ntaub ntawv siv- thiab tus nqi sib npaug. Qhov no ua rau nws tiag tiag yooj yim pom yog tias muaj dab tsi hloov. Piv txwv li ib lub xeev hloov nyob rau hauv ib tug react Cheebtsam.
Tsis tas li ntawd, vim li cas peb thiaj li xav tau kev hloov pauv hauv Java? los ntawm Siv Tau Java ; Ib hloov tsis tau chav kawm tsuas yog ib chav kawm uas nws qhov xwm txheej tsis tuaj yeem hloov kho. Muaj ntau qhov laj thawj zoo rau qhov no: Hloov tsis tau cov chav kawm yog yooj yim rau kev tsim, siv thiab siv dua hloov tau chav kawm. Lawv tsis tshua muaj kev ua yuam kev thiab muaj kev nyab xeeb dua.
Ntxiv rau qhov no, dab tsi yog qhov zoo ntawm cov khoom tsis hloov pauv?
Cov qhov zoo ntawm cov khoom tsis hloov pauv yog tias koj paub lawv cov ntaub ntawv hloov tsis tau, yog li koj tsis tas yuav txhawj txog qhov ntawd. Koj tuaj yeem hla lawv nyob ib puag ncig dawb yam tsis tas yuav nco ntsoov seb ib txoj hauv kev koj hla lawv tuaj yeem hloov pauv lawv txoj hauv kev uas koj cov cai tsis tau npaj los daws. Qhov ntawd ua rau kev ua haujlwm nrog hloov tsis tau cov ntaub ntawv yooj yim dua.
immutability txhais li cas?
hloov tsis tau . Yog tias koj hloov tsis tau, nws yog hloov tsis tau . Lub adjective hloov tsis tau muaj Latin keeb kwm uas txhais tau tias "tsis hloov tau." Lub Latin prefix rau tsis yog nyob rau hauv, tab sis tus spell hloov thaum lub prefix muab tso ua ntej tus consonant m.
Pom zoo:
Vim li cas cov ntaub ntawv tiaj tus tsis zoo dua li cov ntaub ntawv sib raug zoo?
Ib lub rooj ua ntaub ntawv tiaj tus yog qhov tseem ceeb rau kev sau cov ntaub ntawv tsawg. Tab sis cov ntaub ntawv loj loj tuaj yeem ua tsis tau raws li nws siv ntau qhov chaw thiab nco dua li cov ntaub ntawv sib txheeb. Nws kuj yuav tsum tau muab cov ntaub ntawv tshiab ntxiv txhua zaus koj nkag mus rau cov ntaub ntawv tshiab, qhov kev sib raug zoo database tsis
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
Puas yog Java txhawb ntau qhov qub txeeg qub teg Vim li cas lossis vim li cas ho tsis?
Java tsis txhawb ntau qhov qub txeeg qub teg los ntawm cov chav kawm tab sis los ntawm kev sib cuam tshuam, peb tuaj yeem siv ntau yam qub txeeg qub teg. Tsis muaj java tsis txhawb ntau qhov qub txeeg qub teg ncaj qha vim nws ua rau overriding ntawm txoj kev thaum ob chav kawm txuas ntxiv muaj tib lub npe
Puas yog qhov kis nruab nrab yog ib feem ntawm lub cev txheej vim li cas los yog vim li cas ho tsis?
Lub cev txheej hauv OSI Model yog txheej qis tshaj plaws thiab siv rau kev xa cov ntaub ntawv hauv nws daim ntawv yooj yim: ntsis-qib. Qhov nruab nrab kis tau tus mob tuaj yeem yog wired lossis wireless. Cov txheej txheem ntawm lub cev nyob rau hauv ib tug qauv wired muaj xws li cables thiab connectors uas yog siv los nqa cov ntaub ntawv los ntawm ib qho chaw mus rau lwm qhov
Vim li cas yog vim li cas ib txoj hauv kev tseem ceeb ntawm kev paub?
Yog vim li cas thiaj paub. Yog vim li cas feem ntau suav hais tias tsis muaj nuj nqis los ntsuas seb qhov kev lees paub, lossis txawm tias tib neeg, puas ntseeg tau. Yog vim li cas qee zaum sib txawv nrog kev xav, qhov uas cov lus hais txog kev xav thiab kev xav zoo li yuav cuam tshuam peb txoj kev tshawb nrhiav kev paub; hloov peb ntawm 'qhov tseeb