Video: Kev siv FileWriter hauv Java yog dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Java FileWriter chav kawm yog siv sau tus cwj pwm-oriented cov ntaub ntawv rau ib cov ntaub ntawv. Nws yog character-oriented class uas yog siv rau cov ntaub ntawv tuav hauv java ua . Tsis zoo li FileOutputStream chav kawm, koj tsis tas yuav hloov txoj hlua rau hauv byte array vim nws muab txoj hauv kev los sau txoj hlua ncaj qha.
Hais txog qhov no, kev siv FileOutputStream hauv Java yog dab tsi?
Java FileOutputStream . FileOutputStream yog qhov tso zis tso zis rau sau cov ntaub ntawv mus rau Cov Ntaub Ntawv lossis FileDescriptor. FileOutputStream yog siv rau sau kwj ntawm raw bytes xws li cov ntaub ntawv duab. Nws yog qhov zoo rau siv nrog bytes ntawm cov ntaub ntawv uas tsis tuaj yeem sawv cev ua ntawv xws li PDF, Excel cov ntaub ntawv, cov ntaub ntawv duab thiab lwm yam.
Tom qab ntawd, lo lus nug yog, yuav ua li cas kuv thiaj hla cov ntaub ntawv Java? Yog koj sau a file hauv Java uas twb muaj nyob rau hauv qhov chaw, nws yuav overwritten txiav. Tsuas yog koj sau ntawv mus rau qhov ntawd ntaub ntawv nrog ib qho append chij teem rau True. FileWriter fw = new FileWriter(filename, cuav); Nws yuav overwrite cov ntaub ntawv i.e. clear cov ntaub ntawv thiab sau rau nws dua.
Tsis tas li ntawd, FileWriter sau rau qhov twg?
FileWriter yog siv rau sau rau cov ntaub ntawv cim. Nws sau () txoj kev tso cai rau koj sau cim (s) los yog hlua rau ib cov ntaub ntawv. FileWriters feem ntau yog qhwv los ntawm qib siab dua Tus kws sau ntawv cov khoom, xws li BufferedWriter lossis PrintWriter, uas muab kev ua tau zoo dua thiab qib siab dua, hloov pauv txoj hauv kev rau sau cov ntaub ntawv.
Qhov txawv ntawm FileWriter thiab BufferedWriter yog dab tsi?
FileWriter sau ncaj qha rau hauv Cov Ntaub Ntawv thiab yuav tsum tau siv tsuas yog thaum cov ntawv sau tsawg dua. BufferedWriter : BufferedWriter yuav luag zoo ib yam li FileWriter tab sis nws siv internal buffer los sau cov ntaub ntawv rau hauv File. Koj yuav tsum siv BufferedWriter thaum tus naj npawb ntawm kev sau ntawv ntau dua.
Pom zoo:
Dab tsi ntawm cov hauv qab no yog qhov zoo ntawm kev siv cov khoom siv pom kev hauv kev hais lus?
Qhov txiaj ntsig tseem ceeb ntawm kev siv cov khoom siv pom hauv koj cov lus hais yog tias lawv ua kom cov neeg tuaj saib muaj kev txaus siab, hloov kev mloog ntawm tus neeg hais lus, thiab ua rau tus neeg hais lus muaj kev ntseeg siab ntau dua hauv kev nthuav qhia tag nrho
Dab tsi yog qhov txawv ntawm cov neeg siv kev paub thiab kev paub ntawm cov neeg siv khoom?
User Experience (UX) cuam tshuam nrog tib neeg cuam tshuam nrog koj cov khoom thiab cov kev paub uas lawv tau txais los ntawm kev sib cuam tshuam. Customer Experience (CX), incontrast, encompasses tag nrho cov kev sib cuam tshuam ib tug neeg muaj nrog koj hom
Dab tsi yog kev siv overriding sib npaug txoj kev hauv Java?
Override sib npaug thiab hashCode hauv Java sib npaug () txoj kev siv los sib piv Cov Khoom rau kev sib npaug thaum hashCode yog siv los tsim cov lej lej sib npaug rau cov khoom ntawd
Dab tsi yog kev siv cov ntawv cim kev cai li cas koj nkag mus rau hauv Apex cov chav kawm thiab hauv Visualforce nplooj ntawv?
Cov ntawv sau kev cai tso cai rau cov neeg tsim khoom tsim cov ntawv thov ntau hom lus los ntawm kev nthuav qhia cov ntaub ntawv (piv txwv li, pab cov ntawv lossis cov lus yuam kev) hauv tus neeg siv hom lus. Cov ntawv sau kev cai yog cov ntawv sau muaj txiaj ntsig uas tuaj yeem nkag tau los ntawm Apex cov chav kawm, nplooj ntawv Visualforce, lossis cov khoom siv xob laim
Dab tsi yog qhov tseem ceeb ntawm kev siv kev coj ncaj ncees rau cov ntaub ntawv kev ruaj ntseg?
Rau cov kws tshaj lij kev ruaj ntseg cov ntaub ntawv, muaj ob lub hom phiaj tseem ceeb thaum nws los txog rau cov ntaub ntawv tseem ceeb: tiv thaiv nws thiab paub txog nws qhov chaw. Cov koom haum tsis tuaj yeem xav tias cov ntaub ntawv raug cai lossis tau txais los ntawm kev coj ncaj ncees