Java.lang.nullpointerexception shine kuskuren Java da ke faruwa lokacin da aikace-aikacen Java yayi ƙoƙarin amfani da null maimakon wani abu.
An tsawaita RuntimeException ta NullPointerException, wanda aji ne na jama'a.
NullPointerException yana tasowa a cikin yanayi daban-daban, kamar lokacin da kuka kira hanyar misali na abu mara amfani. Hakanan wannan kuskuren zai faru idan abu ya ɓace kuma kuna ƙoƙarin samun dama ko gyara filin wancan null abu.
Idan kayi ƙoƙarin samun tsayin tsararru maras kyau, togiya kuma za a ɗaga.
A cikin wannan labarin, za mu dubi yadda ake sarrafa Null Pointer Exception a Java.
Lokacin da java.lang.nullpointereexception ke faruwa?
Lokacin da aka sami dama ga canjin java wanda baya nuna kowane abu don kowane aiki, java.lang.nullpointereexception ya taso.
Bangaren lokacin gudu java.lang.nullpointereexception banda lokacin aiki shine java.lang.nullpointereexception. Lokacin da kuka ayyana maɓalli amma kar ku sanya shi ga abu har sai kun yi ƙoƙarin amfani da shi, zaku sami java nullpointereexception.
Kana nufin abin da babu shi. A cikin Java, null yana nuna ƙima ta musamman. An fi amfani da shi don nuna cewa ba a keɓance mabambantan ƙima ba ko kuma ba a ba shi wata ƙima ba.
Don guje wa NullPointerException, tabbatar da cewa duk abubuwa an fara su da kyau kafin amfani da m.
Wadannan sune wasu mafi yawan al'amuran NullPointerException:
- Samun kayan aikin banza
- Amfani da mara amfani don kiran hanyoyin
- A kan wani abu mara kyau, ta amfani da aiki tare
- Yin jifa maras amfani daga hanyar togiya-jifa
- Ana wuce gardama maras tushe zuwa hanya.
- Samun dama ga ɓangarori na null abu (kamar a cikin tsararru)
- Don tsarin alluran dogaro kamar bazara, wannan saitin ba daidai bane.
Misalin java.lang.nullpointereexception
Za a jefar da NullPointerException idan an ƙirƙiri madaidaicin Java wanda baya nufin abu kuma ana amfani dashi don aiwatar da wasu ayyuka.
Misalin da ke gaba yana ƙoƙarin tantance tsawon kirtan da aka saita zuwa banza.
Gyara java.lang.nullpointereexception
Gyara 1
Nemo canjin java wanda ke jefa keɓan java.lang. Idan software ta jefa NullPointerException, duba sau biyu cewa an keɓe m ga ƙima ko abu.
Za a yi watsi da java.lang.nullpointereexception idan an sanya ƙima ga mabambantan java.
Gyara 2
Yi amfani da ternary afareta don tantance tsoho ƙimar kafin amfani da java m don gudanar da aikin idan java.lang.nullpointerexception an jefa shi a cikin m.
Za a yi amfani da ƙimar canjin idan yana da ɗaya. In ba haka ba, don guje wa java.lang.nullpointerexception, za a yi amfani da tsohuwar ƙimar.
Gyara 3
Idan baku da tabbacin wanne m ne ke haifar da java.lang.nullpointerexception ko kuma idan akwai damar jefa java.lang.nullpointerexception, ko kuma idan akwai haɗarin jefa java.lang.nullpointerexception a wurare da yawa; yana ɗaukar lokaci don ƙara rajistan banza zuwa lambar.
Don magance matsalar ƙara abin kamawa gare shi.
Gyara 4
Idan maballin java a cikin aikace-aikacen ya jefa java.lang.nullpointerexception, yi duba mara kyau kafin amfani da shi.
Ɗauki hanyar musanya idan canjin ya kasance mara kyau. Za a cire java.nullpointereexception.
Kammalawa
A cikin wannan labarin, mun kalli Java NullPointerException.
Wannan keɓantacce ne mai haɗari wanda sau da yawa yana bayyana lokacin da ba mu zata ba. Mafi yawan sanadin abin da ke haifar da keɓancewar Null Pointer shine abu mara komai ko kuma tunani mara tushe.
Mun riga mun ga mafita mafi inganci.
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