Video: Dab tsi yog qhov kev zam?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
ntes yog los tuav lub kev zam ntawm qhov chaw ntawd nws tus kheej. Li no, qhov kev zov me nyuam txuas ntxiv ib zaug uas cuam tshuam ntes block code raug tua. Yog tsis ntes tau nrog txuam, nws saib rau sab sim.. ntes thaiv. ntawm no, cov cai nram qab no sim thaiv yuav tsis raug tua tshwj tsis yog (tsuas yog thaum kawg thaiv raug tua).
Yog li ntawd, qhov sib txawv ntawm kev cuam tshuam qhov kev zam thiab ntes qhov kev zam yog dab tsi?
Throws 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 rau pov ib qho kev zam , thaum throws 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.
Tsis tas li ntawd, thaum twg koj yuav tsum tau txais kev zam? 8 Teb. Koj yuav tsum ntes tus kev zam thaum koj yog nyob rau hauv txoj kev uas paub dab tsi rau ua. Piv txwv li, tsis nco qab txog nws ua haujlwm li cas rau lub sijhawm, cia peb hais koj tab tom sau ib lub tsev qiv ntawv qhib thiab nyeem cov ntaub ntawv. Ntawm no, tus programmer paub dab tsi rau ua, so ntes tus kev zam thiab kov nws.
Xav txog qhov no, dab tsi yog chav kawm tshwj xeeb?
Cov Chav kawm tshwj xeeb yog lub hauv paus chav kawm los ntawm qhov twg kev zam qub txeeg qub teg. Piv txwv li, InvalidCastException chav kawm hierarchy yog raws li nram no: Object.
JVM ua li cas thaum muaj qhov kev zam tshwm sim Koj puas ntes tau qhov kev zam?
Cov JVM yog lub luag hauj lwm nrhiav ib qho kev zam tus tuav rau txheej txheem cov Kev zam khoom. Nws tshawb nrhiav rov qab los ntawm pawg hu mus txog thaum nws pom qhov sib txuam kev zam handler rau cov chav kawm tshwj xeeb ntawm Kev zam object (hauv Java lub sij hawm, nws yog hu ua " ntes "cov 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
Dab tsi yog qhov dav thawj qhov kev tshawb nrhiav thiab qhov tob thawj qhov kev tshawb fawb?
BFS sawv rau Breadth First Search. DFS sawv cev rau Kev Tshawb Nrhiav Qhov tob. 2. BFS (Breadth First Search) siv Queue cov qauv ntaub ntawv los nrhiav txoj hauv kev luv tshaj. BFS tuaj yeem siv los nrhiav ib qhov chaw luv tshaj plaws hauv cov duab tsis hnyav, vim tias hauv BFS, peb mus txog qhov kawg uas muaj qhov tsawg kawg nkaus ntawm cov npoo los ntawm qhov chaw vertex
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