Video: Koj tshaj tawm qhov piv txwv hloov pauv hauv Java li cas?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Piv txwv variables yog tsim thaum ib khoom yog tsim nrog kev siv lo lus tseem ceeb 'tshiab' thiab puas thaum lub khoom puas lawm. Piv txwv variables tuav qhov tseem ceeb uas yuav tsum tau hais los ntawm ntau tshaj ib txoj kev, tus tsim lossis thaiv, lossis qhov tseem ceeb ntawm ib qho cov khoom hais tias yuav tsum muaj nyob thoob plaws hauv chav kawm.
Ntxiv mus, koj sau qhov piv txwv hloov pauv hauv Java li cas?
Thaum ib qho khoom tsim nrog kev siv lo lus tseem ceeb 'tshiab' ces piv txwv variables raug tsim thiab thaum cov khoom raug puas tsuaj, piv txwv variable kuj raug rhuav tshem. Hauv Java , Piv txwv variables tuaj yeem raug tshaj tawm hauv chav kawm ua ntej lossis tom qab siv. Rau piv txwv variables , access modifiers yuav muab.
Dhau li saum toj no, dab tsi yog txhais los ntawm piv txwv hloov pauv? Nyob rau hauv object-oriented programming nrog cov chav kawm, ib piv txwv variable yog a hloov pauv tau txhais nyob rau hauv ib chav kawm (piv txwv li ib tug tswv cuab sib txawv ), uas txhua yam khoom instantiated ntawm chav kawm muaj ib daim ntawv cais, los yog piv txwv . Ib piv txwv variable zoo ib yam li chav kawm sib txawv . Hloov pauv yog cov khoom ib yam khoom paub txog nws tus kheej.
Ntawm no, dab tsi yog qhov piv txwv hloov pauv hauv Java?
Piv txwv variable hauv Java yog siv los ntawm Objects khaws lawv lub xeev. Hloov pauv uas tau txhais yam tsis muaj STATIC lo lus tseem ceeb thiab yog Sab Nraud txhua txoj kev tshaj tawm yog Object-specific thiab paub tias yog piv txwv variables . Lawv raug hu ua li ntawd vim lawv muaj nuj nqis piv txwv tshwj xeeb thiab tsis sib koom nrog piv txwv.
Yuav ua li cas pib qhov sib txawv hauv Java?
Java kuj tso cai rau koj pib a sib txawv ntawm tib nqe lus uas tshaj tawm cov sib txawv . Txhawm rau ua qhov no, koj siv tus pib pib, uas muaj cov hauv qab no: hom npe = qhia; Nyob rau hauv qhov tseeb, tus thawj tswj hwm cia koj muab cov lus tshaj tawm thiab cov lus tshaj tawm rau hauv ib nqe lus luv luv.
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