Video: Dab tsi yog kev siv hashing hauv Java?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Hashing txhais tau tias siv qee qhov ua haujlwm lossis algorithm los qhia cov ntaub ntawv khoom rau qee tus neeg sawv cev tus lej suav. Qhov no hu ua hash code (los yog yooj yim hash ) tuaj yeem yog siv ua ib txoj hauv kev kom nqaim peb txoj kev tshawb nrhiav thaum nrhiav cov khoom hauv daim ntawv qhia.
Sib tham, dab tsi yog hashing hauv Java?
Hashing yog transforming ib qhov chaw muab (in java ua cov ntsiab lus - ib yam khoom) rau qee tus lej (lossis ib ntus). Modren Java IDEs tso cai rau tsim cov hashCode zoo. Hashtable thiab hashmap yog tib yam. Lawv key-value pairs, qhov twg yuam sij hashed . Hash cov npe thiab hashsets tsis khaws cov txiaj ntsig - tsuas yog cov yuam sij.
Tsis tas li ntawd, hashing txhais li cas? Hashing yog tsim ib tug nqi los yog muaj nuj nqis los ntawm ib txoj hlua ntawm cov ntawv nyeem siv ib tug lej muaj nuj nqi. Ib tug formula generates lub hash , uas pab tiv thaiv kev ruaj ntseg ntawm kev sib kis los ntawm kev cuam tshuam. Hashing kuj yog ib txoj hauv kev los txheeb xyuas cov txiaj ntsig tseem ceeb hauv cov ntaub ntawv database kom ua tau zoo.
Cov lus nug tseem yog, dab tsi yog hashing siv rau?
Hashing yog siv rau index thiab retrieve cov khoom nyob rau hauv ib tug database vim nws yog sai dua mus nrhiav cov khoom siv lub luv luv hashed qhov tseem ceeb tshaj kom pom nws siv tus nqi qub. Nws kuj yog siv hauv ntau encryption algorithms.
Dab tsi yog hashing kev sib tsoo hauv Java?
A kev sib tsoo tshwm sim thaum a hash muaj nuj nqi rov qab tib lub thoob qhov chaw rau ob tus yuam sij sib txawv. A kev sib tsoo yuav tshwm sim thaum ob tus yuam sij sib txawv muaj tib hashCode, uas tuaj yeem tshwm sim vim tias ob qho khoom tsis sib xws hauv Java tuaj yeem muaj tib hashCode.
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