Cov txheej txheem:
Video: Kuv yuav luam ib qho kev zam li cas?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Ntau txoj hauv kev los luam tawm cov lus tshwj xeeb hauv Java
- Siv cov txheej txheem printStackTrace() - Nws luam tawm lub npe kev zam , piav qhia thiab ua tiav pawg kab nrog rau kab nyob qhov twg kev zam tshwm sim. ntes( Kev zam e) { ua.
- Siv toString() method - Nws luam tawm lub npe thiab kev piav qhia ntawm lub kev zam .
- Siv getMessage() txoj kev - Feem ntau siv.
Ib yam li ntawd, koj tuaj yeem nug, qhov tshwj xeeb getMessage () yog dab tsi?
Cov getMessage() txoj kev ntawm Throwable chav kawm yog siv los xa cov ncauj lus kom ntxaws lus ntawm cov khoom Throwable uas tuaj yeem yog null. Ib tus tuaj yeem siv txoj kev no kom tau txais cov ntsiab lus lus ntawm kev zam raws li txoj hlua tus nqi.
Ib sab saum toj no, kuv yuav luam ib pawg kab li cas? Cov pawg kab tuaj yeem luam tawm rau tus qauv yuam kev los ntawm kev hu xov tooj rau pej xeem void printStackTrace () txoj kev zam. Los ntawm Java 1.4, lub pawg kab yog encapsulated rau hauv array ntawm java chav hu ua java. lang. StackTraceElement.
Yog li ntawd, ua li cas koj tsim qhov kev zam hauv Python?
Siv kev zam tuav hauv Python , koj thawj zaug yuav tsum muaj ib tug catch-tag nrho tsuas yog lus. Lo lus "sim" thiab " tsuas yog "yog Python keywords thiab siv los ntes kev zam . sim- tsuas yog [ kev zam -name] (saib saum toj no rau cov piv txwv) blocks Cov cai nyob rau hauv lub sim clause yuav raug executed nqe lus los ntawm nqe lus.
Dab tsi yog qhov tshwj xeeb hauv Python?
Ib kev zam yog ib qho kev tshwm sim, uas tshwm sim thaum lub sij hawm ua tiav ntawm qhov kev pab cuam uas cuam tshuam qhov kev khiav hauj lwm ntawm qhov kev pab cuam cov lus qhia. Feem ntau, thaum a Python tsab ntawv ntsib qhov xwm txheej uas nws tsis tuaj yeem tiv nrog, nws tsa ib qho kev zam . Ib kev zam yog a Python khoom uas sawv cev rau qhov yuam kev.
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
Nws txhais li cas rau pov ib qho kev zam?
Lo lus zam yog luv luv rau cov kab lus 'exceptional event.' Lus Txhais: Ib qho kev zam yog ib qho kev tshwm sim, uas tshwm sim thaum lub sij hawm ua tiav ntawm qhov kev pab cuam, uas cuam tshuam qhov kev khiav hauj lwm ntawm qhov kev qhia cov lus qhia. Tsim ib qho khoom tshwj xeeb thiab xa mus rau lub sijhawm ua haujlwm yog hu ua pov qhov kev zam
Vim li cas NullPointerException yog ib qho kev zam tsis tau txheeb xyuas?
Java NullPointerException yog qhov tsis raug txheeb xyuas thiab txuas ntxiv RuntimeException. NullPointerException tsis yuam kom peb siv catch block los lis nws. Qhov kev zam no zoo li npau suav phem rau feem ntau ntawm java developer zej zog. Lawv feem ntau tshwm sim thaum peb tsawg kawg xav tau lawv
Kuv yuav luam theej duab ib qho app zais hauv kuv lub xov tooj li cas?
Zoo, yog tias koj xav nrhiav cov apps zais ntawm koj lub xov tooj Android, nyem qhov chaw, tom qab ntawd mus rau Cov Ntawv Thov ntu ntawm koj lub xov tooj hauv xov tooj ntawv qhia zaub mov. Saib rau ntawm ob lub khawm navigation. Qhib cov zaub mov saib thiab nias Task. Txheeb xyuas qhov kev xaiv uas hais tias "show hiddenapps"
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