Qhov Tseem Ceeb Qhov txawv - pov vs pov hauv Java
Yuav ua yuam kev thaum programming. Ib qho yuam kev hauv qhov kev zov me nyuam muab qhov tshwm sim tsis tau xav txog lossis nws tuaj yeem txiav qhov kev ua tiav ntawm qhov program. Yog li ntawd, nws yog qhov zoo dua los txheeb xyuas thiab tswj cov kev ua yuam kev kom ua tiav qhov program kom raug. Ib qho yuam kev tuaj yeem yog ob hom. Lawv yog cov compile-time yuam kev thiab runtime yuam kev. Thaum muaj syntax yuam kev, muaj qhia los ntawm Java compiler. Cov no yog hu ua compile-time yuam kev. Qee qhov kev sib sau ua ke-lub sij hawm yuam kev yog ploj lawm semicolon, ploj lawm curly braces, undeclared variables thiab mispelling identifiers los yog lo lus tseem ceeb. Qee zaum, qhov kev zov me nyuam tuaj yeem suav sau tau zoo tab sis nws tuaj yeem muab cov txiaj ntsig tsis raug. Lawv hu ua runtime yuam kev. Qee qhov yuam kev runtime feem ntau faib los ntawm xoom thiab ntsuam xyuas lub ntsiab lus uas tawm ntawm kev sib tw ntawm ib qho array. Ib qho kev zam yog ib qho mob tshwm sim los ntawm kev ua haujlwm yuam kev hauv qhov program. Kev ua tiav qhov kev zov me nyuam xaus thaum muaj kev zam tshwm sim. Yog tias tus programmer xav txuas ntxiv qhov kev ua tiav ntawm cov lej seem, ces tus programmer tuaj yeem ntes cov khoom tshwj xeeb pov los ntawm qhov yuam kev thiab tso tawm cov lus yuam kev. Qhov no yog hu ua exception tuav. Cov cai uas tuaj yeem ua rau muaj qhov yuam kev yog qhov chaw sim thaiv thiab cov lus nyob hauv qhov ntes thaiv. Kev pov thiab pov yog ob lo lus tseem ceeb siv hauv Java kev zam kev tuav. Qhov sib txawv ntawm qhov pov thiab pov hauv Java yog nyob ntawm, pov yog lo lus tseem ceeb uas siv los qhia meej qhov kev zam thaum ntuav yog siv los tshaj tawm qhov kev zam.
Dab tsi yog pov rau hauv Java?
Lo lus tseem ceeb pov yog siv los pov qhov kev zam kom meej. Qhov pov yog ua raws li qhov piv txwv ntawm Exception class. e.g. - Muab pov tseg tshiab ("Yuam kev faib los ntawm xoom"); Nws yog siv nyob rau hauv lub cev txoj kev mus pov ib qho kev zam. Xa mus rau qhov program hauv qab no.
Daim duab 01: Txoj Haujlwm nrog pov lo lus tseem ceeb
Raws li cov kev pab cuam saum toj no, Chav Kawm Exception3 muaj ib txoj hauv kev hu ua checkMarks. Yog tias cov qhab nia tsawg dua 50, nws yuav ua rau muaj kev zam thiab tso tawm "Fail". Yog tias cov qhab nia siab dua lossis sib npaug li 50, nws yuav luam cov lus "Pass".
Dab tsi yog pov hauv Java?
Cov lus tseem ceeb cuam tshuam yog siv los tshaj tawm qhov kev zam. Nws yog ua raws li lub npe tshwj xeeb hauv chav kawm. e.g. - pov Exception. Tus programmer tuaj yeem tshaj tawm ntau qhov kev zam uas siv cov lus tseem ceeb cuam tshuam. Nws yog siv nrog txoj kev kos npe. Saib cov piv txwv hauv qab no.
Daim duab 02: Kev Pabcuam nrog cov lus tseem ceeb
Tus lej uas tuaj yeem muaj qhov yuam kev tau muab tso rau hauv qhov sim dub. Cov lus yuam kev yog nyob rau hauv lub catch block. Tus txheej txheem hu xov tooj qhia tias qee hom kev zam tuaj yeem xav tau los ntawm txoj kev hu ua. Tus neeg hu xov tooj yuav tsum tau npaj nrog qee qhov kev ntes. Hauv qhov xwm txheej no, cov lus tseem ceeb cuam tshuam yog siv. Nws tau teev tseg tam sim ntawd tom qab txoj kev tshaj tawm cov lus tshaj tawm thiab ua ntej qhov qhib brace.
Dab tsi yog qhov zoo sib xws ntawm kev pov thiab pov hauv Java?
Ob leeg yog lo lus tseem ceeb hauv Java rau kev zam kev tuav
Qhov txawv ntawm qhov pov thiab pov hauv Java yog dab tsi?
pov vs pov hauv Java |
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| The 'pov' yog lo lus tseem ceeb hauv Java uas yog siv los cuam tshuam qhov kev zam. | The 'thaws' yog lo lus tseem ceeb hauv Java uas yog siv los tshaj tawm qhov kev zam. |
| Ntau qhov zam | |
| Yuav tsis tuaj yeem muaj ntau qhov kev zam nrog pov. | Yuav muaj ntau qhov zam nrog ntuav. |
| taug qab los ntawm | |
| Tus 'pw' yog ua raws li piv txwv. | The 'thaws' yog ua raws li chav kawm. |
| Txoj kev siv | |
| Qhov 'pw' yog siv nyob rau hauv txoj kev. | The 'thaws' yog siv nrog txoj kev kos npe. |
Summary – pov vs pov hauv Java
Run time yuam kev ua rau qhov kev zov me nyuam sau tab sis nws muab cov txiaj ntsig xav tau lossis txiav tawm qhov kev ua tiav ntawm qhov program. Qhov xwm txheej ntawd yog ib qho kev zam. Lub pov thiab pov yog ob lo lus tseem ceeb siv hauv Java programming rau kev tuav pov hwm. Kab lus no tau tham txog qhov sib txawv ntawm kev pov thiab pov. Qhov sib txawv ntawm kev pov thiab pov hauv Java yog qhov pov yog lo lus tseem ceeb siv los qhia meej qhov kev zam thaum ntuav yog siv los tshaj tawm qhov kev zam.
