Video: Dab tsi yog pov qhov kev zam Java?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Cov pov lo lus tseem ceeb hauv Java yog siv los qhia meej pov ib qho kev zam los ntawm ib txoj kev los yog ib qho thaiv ntawm cov cai. Peb ua tau pov check los yog unchecked kev zam . Cov pov lo lus tseem ceeb yog siv los ua pov kev cai kev zam.
Ua li no, nws txhais li cas rau pov qhov kev zam hauv Java?
pov lo lus tseem ceeb yog siv los tshaj tawm tias ib txoj kev yuav pov ib los yog ib co kev zam . Tus hu yuav tsum ntes tus kev zam . Xav tias hauv koj java ua program koj siv lub tsev qiv ntawv txoj kev uas pov ib Exception . Hauv koj qhov program, koj yuav ua qhov no kev zam siv sim & ntes.
Ib sab saum toj no, peb puas tuaj yeem pov qhov tshwj xeeb manually? Pov cov kev zam manually Koj tuaj yeem pov tus neeg siv txhais kev zam los yog, predefined kev zam meej meej siv cov pov lo lus tseem ceeb. Muaj ob hom kev zam tus neeg siv txhais thiab predefined txhua kev zam yog sawv cev los ntawm ib chav kawm thiab uas tau txais cov chav kawm Throwable.
Ua raws li qhov xav tau, qhov sib txawv ntawm qhov cuam tshuam thiab cuam tshuam dab tsi hauv Java zam kev tuav?
Pov clause yog siv los tshaj tawm ib qho kev zam , uas txhais tau tias nws ua haujlwm zoo ib yam li kev sim- ntes thaiv. Pov lo lus tseem ceeb yog siv hauv method lub cev pov ib kev zam , thaum pov yog siv nyob rau hauv txoj kev kos npe rau tshaj tawm cov kev zam uas tuaj yeem tshwm sim hauv nqe lus tam sim no hauv txoj kev.
Dab tsi yog pov rau hauv kev zam tuav?
pov lo lus tseem ceeb yog siv rau pov ib kev zam qhia meej. Tsuas yog cov khoom ntawm Throwable class lossis nws cov chav kawm sub tuaj yeem ua tau pov . Kev ua tiav qhov kev zov me nyuam nres thaum ntsib pov nqe lus, thiab qhov ze tshaj plaws ntes nqe lus raug tshuaj xyuas rau hom sib txuam kev zam.
Pom zoo:
Dab tsi yog qhov Performance index tawm ntawm kev zam zam hauv Java?
Index Out of Bound Exception. Index Out of Bound Exception yog qhov Unchecked Exception uas tshwm sim ntawm kev khiav haujlwm yuam kev. Qhov no tshwm sim vim qhov tsis raug parameter dhau mus rau ib txoj hauv kev hauv cov cai. Lub java Compiler tsis kuaj qhov yuam kev thaum lub sij hawm muab tso ua ke ntawm ib qho kev pab cuam
Dab tsi yog qhov sib txawv loj ntawm kev txheeb xyuas qhov yuam kev thiab kev kho cov lej yuam kev?
Ob qhov kev tshawb nrhiav qhov yuam kev thiab kev kho qhov yuam kev yuav tsum muaj qee qhov ntawm cov ntaub ntawv rov qab xa mus nrog cov ntaub ntawv tiag tiag; kev kho yuav tsum muaj ntau tshaj li kev tshawb nrhiav. Parity bits yog ib txoj hauv kev yooj yim rau kev tshawb nrhiav qhov yuam kev. Ib qho parity me ntsis yog ib qho ntxiv me ntsis xa nrog cov ntaub ntawv uas tsuas yog 1-ntsis suav ntawm cov ntaub ntawv
Puas muaj ib txoj hauv kev pov tseg qhov kev kuaj xyuas los ntawm txoj kev uas tsis muaj cov lus pov tseg?
9 Teb. Koj tuaj yeem pov cov kev txwv tsis raug txheeb xyuas yam tsis tas yuav tshaj tawm lawv yog tias koj xav tau tiag tiag. Unchecked kev zam txuas ntxiv RuntimeException. Throwables uas txuas ntxiv yuam kev tseem tsis tau txheeb xyuas, tab sis tsuas yog yuav tsum tau siv rau cov teeb meem loj tiag tiag (xws li invalid bytecode)
Qhov kev zam ToString puas suav nrog kev zam sab hauv?
ToString() yuav qhia hom kev zam, lus, ntxiv rau ib qho kev zam sab hauv. Tsis tas li ntawd xwb! Yog tias FaultException yog InnerException ntawm, piv txwv li, System
Dab tsi yog qhov yuam kev thiab kev zam hauv Java?
Qhov yuam kev 'qhia txog teeb meem loj uas daim ntawv thov tsim nyog yuav tsum tsis txhob sim ntes.' thaum. Ib qho Exception 'qhia tau hais tias ib daim ntawv thov tsim nyog yuav xav ntes.' Yuam kev nrog rau RuntimeException & lawv cov subclasses yog unchecked kev zam. Tag nrho lwm cov chav kawm Exception raug kuaj xyuas