Cov txheej txheem:
Video: Puas yog Date object mutable hauv Java?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
A mutable khoom yog ib qho yooj yim khoom uas tuaj yeem hloov nws lub xeev tom qab kev tsim kho. Piv txwv li, StringBuilder thiab Hnub tim yog mutable khoom , thaum String thiab Integer tsis hloov tau khoom . Ib chav kawm yuav muaj a mutable khoom raws li teb.
Ib yam li ntawd, Date chav kawm tsis hloov pauv 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.
Tom qab, lo lus nug yog, dab tsi yog qhov khoom tsis hloov hauv Java? Cov khoom tsis hloov tau yog khoom uas tsis hloov. Koj ua lawv, ces koj hloov tsis tau lawv. A Java immutable object yuav tsum muaj tag nrho nws cov teb yog sab hauv, ntiag tug kawg teb. Nws yuav tsum tsis txhob siv tej setters. Nws xav tau tus tsim qauv uas siv tus nqi rau txhua qhov chaw.
Ntawm no, cov khoom puas hloov tau hauv Java?
Cov khoom tsis hloov tau yog yooj yim khoom uas state (the khoom data) hloov tsis tau tom qab kev tsim kho. Piv txwv ntawm yam khoom tsis hloov tau los ntawm JDK suav nrog String thiab Integer. Mutable khoom muaj cov teb uas hloov tau, yam khoom tsis hloov tau muaj tsis muaj teb uas yuav hloov tau tom qab lub khoom yog tsim.
Yuav ua li cas koj ua ib yam khoom mutable 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.
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