Iyo java.lang.nullpointerexception kukanganisa kweJava kunoitika kana Java application ichiedza kushandisa isina chinhu pachinzvimbo chechinhu.
Iyo RuntimeException inowedzerwa neNullPointerException, iri kirasi yeruzhinji.
Iyo NullPointerException inosimudzwa mune akasiyana mamiriro, senge kana iwe uchidaidza iyo muenzaniso nzira yechinhu chisina chinhu. Kukanganisa uku kuchaitikawo kana chinhu chisina basa uye ukaedza kuwana kana kugadzirisa ndima yechinhu ichocho chisina maturo.
Kana iwe ukaedza kuwana hurefu hweasina null array, kusarudzika kunosimudzwa zvakare.
Muchikamu chino, tichatarisa maitiro ekubata Null Pointer Exception muJava.
Kana java.lang.nullpointerexception ikaitika?
Kana java vhezheni isinganonge kune chero chinhu ichipinzwa chero chiitiko, iyo java.lang.nullpointerexception inosimuka.
Runtime kunze kwejava.lang.nullpointerexception kunze kwenguva yekumhanya ndeye java.lang.nullpointerexception. Paunotsanangura shanduko asi usingaipe kune chinhu kudzamara waedza kuishandisa, iwe unowana java nullpointerexception.
Uri kureva chinhu chisipo. MuJava, null inoreva imwe kukosha. Inonyanya kushandiswa kuratidza kuti referensi vhezheni haina kupihwa kukosha kana kuti haina kupihwa chero kukosha.
Kuti udzivise NullPointerException, ita shuwa kuti zvinhu zvese zvinotangwa zvakanaka usati washandisa shanduko.
Aya anotevera ndemamwe eanowanzoitika NullPointerException scenarios:
- Kusvika pazvimiro zvechinhu chisina maturo
- Kushandisa chinhu chisina maturo kudana nzira
- Pachinhu chisina maturo, uchishandisa synchronized
- Kukanda null kubva kune imwe nzira yekukanda
- Nhau dzisina maturo dzinopfuudzwa kune imwe nzira.
- Kuwana chinhu chisina chinhu che index element (sezviri muhurongwa)
- Zvekutsamira jekiseni masisitimu seChitubu, kuseta uku hakuna kunaka.
Muenzaniso we java.lang.nullpointerexception
Iyo NullPointerException ichakandwa kana shanduro yeJava yagadzirwa iyo isingarevi chinhu uye inoshandiswa kuita chimwe chiitiko.
Muenzaniso unotevera unoedza kuona kureba kwetambo yaiswa kuti ishaye simba.
Kugadzirisa iyo java.lang.nullpointerexception
Gadzirisa 1
Tsvaga iyo java shanduko inokanda iyo java.lang kunze. Kana iyo software ikakanda NullPointerException, kaviri-tarisa kuti shanduko yakagoverwa kune kukosha kana chinhu.
Iyo java.lang.nullpointerexception icharaswa kana kukosha kwaiswa kune java variable.
Gadzirisa 2
Shandisa ternary opareta kutsanangura kukosha kweiyo default usati washandisa java chinja kuita chiito kana java.lang.nullpointerexception inokandwa mukusiyana.
Kukosha kwekusiyana kuchashandiswa kana iine imwe. Zvikasadaro, kudzivirira a java.lang.nullpointerexception, iyo default value yaizoshandiswa.
Gadzirisa 3
Kana usina chokwadi kuti ndeupi shanduko iri kukonzera java.lang.nullpointerexception kana paine mukana wekukanda java.lang.nullpointerexception, kana paine njodzi yekukanda java.lang.nullpointerexception munzvimbo dzakawanda; zvinotora nguva kuwedzera cheki isina maturo kukodhi.
Kuti ugadzirise nyaya wedzera kubata pairi.
Gadzirisa 4
Kana iyo java vhezheni muapp ikakanda java.lang.nullpointerexception, ita null cheki usati waishandisa.
Tora imwe nzira kana shanduko isina. Iyo java.nullpointerexception ichabviswa.
mhedziso
Muchikamu chino, takatarisa iyo Java NullPointerException.
Iyi inyaya ine ngozi inowanzo onekwa patinenge tisingatarisiri. Icho chinonyanya kukonzera cheNull Pointer Exception chinhu chisina chinhu kana null referensi.
Takatoona mhinduro dzinoshanda.
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