Video: Ordinal () method hauv Java yog dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Cov txujci () method rov qab qhov kev txiav txim ntawm ib qho piv txwv. Nws sawv cev rau qhov sib lawv liag hauv qhov kev tshaj tawm enum, qhov twg qhov pib qhov tsis tu ncua yog muab rau ib qho kev cai ntawm '0'. Nws yog tsim los rau kev siv los ntawm cov txheej txheem enum-based cov ntaub ntawv, xws li EnumSet thiab EnumMap.
Yog li ntawd, lub hom phiaj ntawm enum hauv Java yog dab tsi?
nyob rau hauv Java . Enumerations pab cov lub hom phiaj ntawm sawv cev ib pab pawg ntawm cov npe tsis tu ncua hauv ib hom lus programming. Lub hom phiaj tseem ceeb ntawm enum yog los txhais peb tus kheej cov ntaub ntawv hom (Enumerated Data Types). Tshaj tawm ntawm enum hauv java : Enum Kev tshaj tawm tuaj yeem ua rau sab nraud ntawm Chav Kawm lossis hauv Chav Kawm tab sis tsis nyob hauv Txoj Kev.
Ib yam li ntawd, hom twg yog enum Java? A Java Enum yog qhov tshwj xeeb Java hom siv los txhais cov collections ntawm tas mus li. Ntau precisely, a Java enum type yog qhov tshwj xeeb laj Java chav kawm. Ib enum tuaj yeem muaj qhov tsis tu ncua, cov txheej txheem thiab lwm yam. Java cov tau ntxiv rau hauv Java 5.
Ib sab saum toj no, enums ua haujlwm li cas?
Ib enum yog hom ntaub ntawv uas muaj cov txheej txheem tas mus li. Ib enum zoo ib yam li chav kawm, nrog rau cov xwm txheej tas li uas paub thaum sau lub sijhawm. Qhov zoo ntawm enum : enum txhim kho hom kev nyab xeeb ntawm kev txheeb xyuas lub sijhawm kom tsis txhob ua yuam kev thaum lub sijhawm ua haujlwm.
Enum lub npe yog dab tsi?
Java Enum npe () Method npe () txoj kev Enum chav kawm rov qab rau npe ntawm no enum tas li tib yam li tshaj tawm hauv nws enum tshaj tawm. Txoj kev toString() feem ntau yog siv los ntawm programmers vim nws yuav rov qab siv tau yooj yim dua npe piv rau cov npe () txoj kev.
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