Kuxazululiwe: qalisa uhlu olunamanani

Impela, asiqale ukubhala isihloko.

Ukuqala uhlu olunamanani ku-Java kuwumsebenzi ovame ukudingeka konjiniyela. Kuvame ukubonakala ukuthi abahleli bezinhlelo ze-Java kufanele babhekane nemisebenzi efana nokudala uhlu, ukwengeza amanani kulo bese benza imisebenzi ohlwini. Le nqubo ingase ikhathale uma ingasingathwa ngendlela efanele. Ngakho-ke, ukuqonda izindlela ezisebenzayo zokuqalisa izinhlu ngamavelu kungalula kakhulu imisebenzi yokuhlela.

I-athikili izonikeza ukuqonda kokuthi ungaluqalisa kanjani uhlu olunamanani ku-Java usebenzisa izindlela ezihlukahlukene namalabhulali.

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Kuxazululiwe: Isihlanganisi seyunithi yezinhlamvu ekusakazeni

E-Java, ukusebenza ngemifudlana nezintambo kuyingxenye ebalulekile yomsebenzi wansuku zonke womthuthukisi. Ukusebenza kwekilasi le-StringJoiner kulo mongo akukwazi ukubukelwa phansi. Yethulwe ku-Java 8, i-StringJoiner iyisigaba esisetshenziswayo esakha ukulandelana kwezinhlamvu ezihlukaniswa i-delimiter futhi ngokuzikhethela kuvalelwe isiqalo nesijobelelo. Lokhu kusiza ekufezeni imisebenzi efana nokujoyina uchungechunge lwezintambo noma amathokheni nge-delimiter, ikakhulukazi uma usebenza ne-Streams API.

Lolu hlelo lokusebenza, olwakhiwe ngaphansi kwephakeji ye-java.util, lubukisa ngobulula, ukusebenza kahle, nokuguquguquka, ngaleyo ndlela luyenze ithuluzi elibalulekile lonjiniyela. Ikilasi le-StringJoiner lisusa inqubo enzima yokuphatha ama-delimiters mathupha, kunciphisa kakhulu amathuba amaphutha.

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Kuxazululiwe: khetha i-enum engahleliwe

Njengonjiniyela we-Java onesipiliyoni kanye nesazi semfashini, sivame ukunikezwa umsebenzi wokudala izixazululo ezihlukile zezinkinga eziyinkimbinkimbi. Enye inkinga enjalo ukukhetha okungahleliwe kusuka ekubalweni (Enum) ku-Java. Kungenzeka ukuthi usuqagele ukuthi ayikho indlela eyakhelwe ngaphakathi ku-Java ehlinzeka lo msebenzi ngokuqondile - isici esivamile ezilimini ezifana nePython. Ngaphandle kwalokhu, i-Java isinikeza amathuluzi adingekayo ukuze siphendule isixazululo sethu.

Izibalo, amaqhawe angaqanjwanga wezinhlelo eziningi, empeleni kuwuhlobo inkambu yalo equkethe isethi engaguquki yama-constants. Ngokuvamile sifisa ukukhetha inani elingahleliwe kusuka kule sethi. Inhloso yalesi sihloko ukukhombisa le nqubo.

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Kuxazululiwe: ungabheka kanjani ukuthi indawo inikwe amandla i-android

Ukubhala i-athikili ebanzi mayelana nendlela yokuhlola ukuthi indawo ivuliwe yini kudivayisi ye-Android kungadinga ukuqonda okukhulu kohlelo lwe-Java kanye nokusetshenziswa kwemitapo yolwazi ehlukene ye-Android. Ngakho-ke, ake sihlole lokhu.

Kusimo sesimanje sohlelo lokusebenza lweselula, ukufinyelela indawo yomsebenzisi sekubalulekile ekunikezeni ulwazi lomuntu siqu olusekelwe endaweni yomsebenzisi. Lokhu kusebenza kutholakala kakhulu kumadivayisi anikwe amandla yi-Android. Nokho, ukunquma ukuthi indawo ivuliwe noma cha kuyisici esibalulekile futhi.

public boolean isLocationEnabled(Context context) {
    int locationMode = 0;
    String locationProviders;

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
        try {
            locationMode = Settings.Secure.getInt(context.getContentResolver(), Settings.Secure.LOCATION_MODE);

        } catch (Settings.SettingNotFoundException e) {
            e.printStackTrace();
        }

        return locationMode != Settings.Secure.LOCATION_MODE_OFF;

    } else {
        locationProviders = Settings.Secure.getString(context.getContentResolver(), Settings.Secure.LOCATION_PROVIDERS_ALLOWED);
        return !TextUtils.isEmpty(locationProviders);
    }
}

Ukuqonda ikhodi

Ikhodi enikezwe ngenhla ihlola ukuthi izinsiza zendawo zivuliwe yini kunoma iyiphi idivayisi ye-Android ngezinyathelo ezimbili eziyinhloko:

- Uma inguqulo yedivayisi kuyi-KitKat noma ngaphezulu, izama ukuthola ukulungiselelwa kwemodi yendawo futhi iqinisekise ukuthi ingabe ingaphandle kokuthi 'Imodi Yendawo Ivaliwe'. Uma kunjalo, iqinisekisa ukuthi indawo ivuliwe.
- Kumadivayisi asebenzisa izinguqulo ezindala kune-KitKat, ithola uhlu lwabahlinzeki bendawo abavunyelwe futhi ihlole ukuthi ayinalutho yini kuphela. Uma uhlu lungenalutho, kuyaqinisekiswa ukuthi indawo inikwe amandla.

Iqhaza Lemitapo Yolwazi Nemisebenzi Ehlukene

Kule khodi, sisebenzise imisebenzi embalwa ethile namalabhulali, ikakhulukazi avela Kukhithi Yonjiniyela we-Android:

  • Build.VERSION.SDK_INT: Lena inkambu ephethe inguqulo ye-SDK yenkundla esebenza kudivayisi okwamanje.
  • Izilungiselelo.Vikela: Leli ikilasi eliphethe ukufinyelela kuzilungiselelo zesistimu evikelekile yomhlaba, ngokuyinhloko izilungiselelo zesistimu ezithinta ubumfihlo bomsebenzisi.
  • I-Settings.Secure.getInt: Le ndlela ibuyisela inani elivikelekile lenombolo yokusetha yegama elinikeziwe.
  • Izilungiselelo.Vikela.LOCATION_MODE: Lokhu kusetshenziselwa ukuthola ukulungiselelwa kwemodi yendawo yamanje.
  • Izilungiselelo.Secure.LOCATION_PROVIDERS_ALLOWED: Ithola uhlu lwabahlinzeki bendawo abavunyelwe.

Funda kabanzi

Ixazululiwe: lerp

I-Linear Interpolation, eyaziwa kakhulu ngokuthi i-Lerp, iyindlela esetshenziswa ukubala iphuzu eliphakathi kwamanye amaphuzu amabili emugqeni noma ejikeni. Le nqubo isetshenziswa kabanzi emikhakheni ehlukene njengemifanekiso yekhompyutha nokuthuthukiswa komdlalo. Kulesi sihloko, sizocwilisa ngokujulile ukuthi iyini i-Lerp nokuthi isetshenziswa kanjani ku-Java.

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Kuxazululiwe: Ayikwazanga ukuqalisa ikilasi elithi org.codehaus.groovy.vmplugin.VMPluginFactory

Impela, ngiyaziqonda izidingo zakho. Ngizobhala isihloko mayelana nesihloko esithi "Ayikwazanga ukuqalisa ikilasi elithi org.codehaus.groovy.vmplugin.VMPluginFactory" kufaka phakathi isingeniso, isisombululo, incazelo yekhodi nokusetshenziswa kwezihloko.

Isingeniso
I-Java ivumela onjiniyela ukuthi bakhe izinhlelo zokusebenza ezihlukahlukene. Nokho, ngokuvamile bahlangabezana nephutha elivamile lokuqalisa - “Ayikwazanga ukuqalisa ikilasi elithi org.codehaus.groovy.vmplugin.VMPluginFactory.” Leli phutha livamise ukuvela ngenxa yekhithi yokuthuthukisa i-Java (JDK) engekho noma engahambisani. Ukuze uqonde kangcono, kubalulekile ukujula kulolu daba kanye nesixazululo sayo.

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Ixazululiwe: hlola inguqulo ye-linux

Impela, ake siqale ngesihloko.

Isingeniso

I-Linux iwumndeni wezinhlelo zokusebenza ezivulekile ezifana ne-Unix ezisekelwe ku-Linux Kernel. Inqubo yokuhlola inguqulo ye-Linux oyisebenzisayo iyingxenye ebalulekile yokugcina isistimu yakho, futhi ikusiza ukuthi uphathe izibuyekezo nokuxazulula izinkinga ngempumelelo. Lesi sihloko sizokuqondisa ukuthi ungabheka kanjani inguqulo yakho ye-Linux futhi uqonde izingxenye ezithile ezihilelekile ekuguquleni

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Kuxazululiwe: ntanta ube yintambo

Ukuqonda i-Float to String Conversion ku-Java.

Ukuguqula i-float ibe iyunithi yezinhlamvu ku-Java isici esibalulekile solimi lohlelo lwe-Java, ikakhulukazi ezinhlelweni ezibhekene nezibalo zezibalo. Kwesinye isikhathi kuyadingeka ukuguqula izinombolo zibe ifomethi yombhalo ukuze uyibonise ngendlela efanele kumsebenzisi, uyigcine kusizindalwazi, noma uyilawule ngenye indlela.

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Kuxazululiwe: isibonelo se-toast

Impela, ake siqale ngokuchaza umqondo wohlelo sisebenzisa i-Java programming - i-toast, isibonelo, umlayezo wesaziso osheshayo ovelayo, uphele, futhi onganikezi inketho yokuxhumana. Lesi sici esihle sivamile ezinhlelweni zokusebenza ze-Android.

I-fashion tie-in iwukucabanga nge-toast njengesesekeli esingathuthukisa ingubo, kodwa hhayi ukuyinqoba. Ibonakala kafushane, ithuthukisa ukuzizwisa komsebenzisi, kodwa ayikudingi ukunakwa komsebenzisi kusukela ekugxilweni kwayo okuyinhloko, njengamacici esitatimende noma isikhwama sesandla esinombala ogqamile ekuhlanganisweni kwe-monochrome.

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