Java

Ngokuqinisekileyo, masiqale ukubhala inqaku.

Ukuqala uluhlu olunamaxabiso kwiJava lumsebenzi oqhele ukufunwa ngabaphuhlisi. Kuhlala kubonwa ukuba abadwelisi beenkqubo zeJava kufuneka bajongane nemisebenzi efana nokudala uluhlu, ukongeza amaxabiso kulo kwaye emva koko benze imisebenzi kuluhlu. Le nkqubo inokudinwa ukuba ayiphathwa ngokufanelekileyo. Ke ngoko, ukuqonda iindlela ezisebenzayo zokuqalisa uluhlu olunamaxabiso kunokulungelelanisa kakhulu imisebenzi yokucwangcisa.

Inqaku liza kunika ukuqonda malunga nendlela yokuqalisa uluhlu olunamaxabiso kwiJava usebenzisa iindlela ezahlukeneyo kunye namathala eencwadi.

Funda Okuninzi

KwiJava, ukusebenza ngemijelo kunye neentambo yinxalenye ebalulekileyo yomsebenzi wemihla ngemihla womphuhlisi. Ukusebenza kweklasi ye-StringJoiner kulo mxholo ayinakujongelwa phantsi. Yaziswa kwiJava 8, iStringJoiner luludidi oluluncedo olwakha ukulandelelana kweempawu ezahlulwe ngumdimiter kwaye zifakwe ngokukhethwa sisimaphambili kunye nesimamva. Oku kunceda ekufezekiseni imisebenzi efana nokujoyina umlambo weentambo okanye iimpawu nge-delimiter, ngakumbi xa usebenza ne-Streams API.

Esi sixhobo, esakhiwe phantsi kwepakethe ye-java.util, ibonakalisa ngokulula, ukusebenza kakuhle, kunye nokuguquguquka, ngaloo ndlela isenza isixhobo esibalulekileyo kubaphuhlisi. Iklasi ye-StringJoiner iphelisa inkqubo enzima yokuphatha i-delimiters ngesandla, ukunciphisa kakhulu amathuba eempazamo.

Funda Okuninzi

Njengomphuhlisi onamava weJava kunye nesazi sefashoni, sihlala sinikwe umsebenzi wokudala izisombululo ezizodwa kwiingxaki ezinzima. Enye ingxaki enjalo lukhetho olungakhethiyo olusuka kubalo (Enum) kwiJava. Usenokuba sele uqikelele ukuba akukho ndlela eyakhelweyo kwiJava ebonelela lo msebenzi ngokuthe ngqo-into eqhelekileyo kwiilwimi ezifana nePython. Ngaphandle koku, iJava isinika izixhobo eziyimfuneko zokujikeleza isisombululo sethu.

Ubalo, amaqhawe angavunywanga eenkqubo ezininzi, luhlobo olunebala eliquka isethi esisigxina yezinto eziguquguqukayo. Rhoqo sinqwenela ukukhetha ixabiso elingenamkhethe kolu seti. Injongo yeli nqaku kukubonisa le nkqubo.

Funda Okuninzi

Ukubhala inqaku elibanzi malunga nendlela yokukhangela ukuba indawo ivuliwe kwisixhobo se-Android kunokufuna ukuqonda okunzulu kwenkqubo yeJava kunye nokusetyenziswa kweelayibrari ezahlukeneyo ze-Android. Ngoko, makhe sihlolisise oku.

Kumhlaba wangoku wesicelo sefowuni, ukufikelela kwindawo yomsebenzisi kuye kwaba yinto ebalulekileyo ekuboneleleni ngamava omntu ngokusekwe kwindawo yomsebenzisi. Lo msebenzi ufumaneka kakhulu kwizixhobo ezixhaswe yi-Android. Nangona kunjalo, ukufumanisa ukuba indawo leyo ivuliwe okanye hayi ngumba obalulekileyo ngokunjalo.

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 ikhowudi

Ikhowudi enikwe ngasentla ijonga ukuba iinkonzo zendawo zinikwe amandla kuso nasiphi na isixhobo se-Android ngamanyathelo amabini aphambili:

- Ukuba uguqulelo lwesixhobo yiKitKat okanye ngaphezulu, izama ukufumana imowudi yendawo kwaye iqinisekise ukuba ayikho enye ngaphandle 'Indlela yeNdawo ivaliwe'. Ukuba kunjalo, iqinisekisa ukuba indawo leyo ivuliwe.
Kwizixhobo ezisebenza kwiinguqulelo ezindala kuneKitKat, ifumana uluhlu lwababoneleli bendawo abavunyelweyo kwaye ijonge ukuba ayinanto kuphela. Ukuba uluhlu alunanto, kuqinisekisiwe ukuba indawo leyo yenziwe yasebenza.

Indima yamaThala eencwadi ahlukeneyo kunye neMisebenzi

Kule khowudi, sisebenzise imisebenzi embalwa ethile kunye namathala eencwadi, ikakhulu asuka kwiKit yoMphuhlisi we-Android:

• Build.VERSION.SDK_INT: Le yintsimi ebambe inguqulelo ye-SDK yeqonga elisebenzayo ngoku kwisixhobo.
• Iisetingi.Khusela: Olu ludidi olulawula ukufikelela kwiisetingi zenkqubo ekhuselekileyo yehlabathi, ngokuyintloko useto lwenkqubo oluchaphazela ubumfihlo bomsebenzisi.
• Iisetingi.Secure.getInt: Le ndlela ibuyisela inani elipheleleyo lokucwangcisa ixabiso legama elinikiweyo.
• Iisetingi.Khusela.LOCATION_MODE: Oku kusetyenziselwa ukufumana imo yendlela yendawo yangoku.
• Iisetingi.Secure.LOCATION_PROVIDERS_ALLOWED: Ifumana uluhlu lwababoneleli bendawo abavunyelweyo.

Funda Okuninzi

I-Linear Interpolation, eyaziwa ngokuba yi-Lerp, yindlela esetyenziswayo ukubala inqaku eliphakathi kwamanye amanqaku amabini kumgca okanye igophe. Obu buchule busetyenziswa kakhulu kwiinkalo ezahlukeneyo ezifana nemizobo yekhompyuter kunye nophuhliso lomdlalo. Kweli nqaku, siza kuntywila nzulu kwinto eyiLerp kunye nendlela yokuyiphumeza kwiJava.

Funda Okuninzi

Ngokuqinisekileyo, ndiyaziqonda iimfuno zakho. Ndiza kubhala inqaku malunga nesihloko esithi "Ayikwazanga ukuqalisa iklasi org.codehaus.groovy.vmplugin.VMPluginFactory" kuquka isingeniso, isisombululo, inkcazo yekhowudi kunye nokusetyenziswa kweentloko.

intshayelelo
IJava ivumela abaphuhlisi ukuba benze usetyenziso oluguquguqukayo. Nangona kunjalo, bahlala bedibana nempazamo eqhelekileyo yokuqalisa - "Ayikwazanga ukuqalisa iklasi org.codehaus.groovy.vmplugin.VMPluginFactory." Le mpazamo idla ngokuvela ngenxa yeKhithi yoPhuhliso lweJava elahlekileyo okanye engahambelaniyo (JDK). Ukuze uqonde ngcono, kubalulekile ukuntywila nzulu kulo mbandela kunye nesisombululo sayo.

Funda Okuninzi

Ngokuqinisekileyo, masiqale ngesihloko.

intshayelelo

I-Linux lusapho lomthombo ovulekileyo weenkqubo zokusebenza ezifana ne-Unix ezisekwe kwi-Linux Kernel. Inkqubo yokujonga inguqulelo yeLinux oyisebenzisayo yinxalenye ebalulekileyo yokugcina inkqubo yakho, kwaye ikunceda ukuba ulawule uhlaziyo kunye nemiba yokusombulula kakuhle. Eli nqaku liza kukukhokela malunga nendlela yokujonga inguqulelo yakho yeLinux kwaye uqonde amacandelo athile abandakanyekayo kuguqulelo

Funda Okuninzi

Ukuqonda i-Float kwi-String Conversion kwiJava.

Ukuguqula ukudada kumtya kwiJava ngumba obalulekileyo wolwimi lwenkqubo yeJava, ngakumbi kwiinkqubo ezijongene nokubala kwemathematika. Ngamanye amaxesha kuyimfuneko ukuguqula amanani kwifomathi yokubhaliweyo ukuyibonisa ngokufanelekileyo kumsebenzisi, ukuyigcina kwisiseko sedatha, okanye ukuyiphatha ngenye indlela.

Funda Okuninzi

Ngokuqinisekileyo, masiqale ngokuchaza ingcamango yeprogram usebenzisa i-Java programming - i-toast, umzekelo, umyalezo wesaziso okhawulezayo ovelayo, uphela, kwaye awunikezeli ukhetho lokusebenzisana. Eli nqaku lincinci lixhaphakile kwizicelo ze-Android.

I-fashion tie-in kukucinga nge-toast njengesixhobo esinokuyiphucula impahla, kodwa ingagqithisi. Ibonakala ngokufutshane, iphucula amava omsebenzisi, kodwa ayifuni ingqwalasela yomsebenzisi kude neyona nto iphambili ekugxilwe kuyo, njengamacici enkcazo okanye ibhegi enemibala eqaqambileyo kwi-monochrome ensemble.

Funda Okuninzi