Java

Tabbas, bari mu fara rubuta labarin.

Ƙaddamar da jeri tare da ƙima a Java aiki ne da ake buƙata don masu haɓakawa. Sau da yawa ana ganin cewa masu shirye-shiryen Java dole ne su magance ayyuka kamar ƙirƙirar jeri, ƙara ƙima zuwa gare shi sannan kuma aiwatar da ayyuka akan jerin. Wannan tsari na iya zama mai gajiyawa idan ba a kula da shi yadda ya kamata ba. Don haka, fahimtar ingantattun hanyoyi don fara lissafin da ƙima na iya daidaita ayyukan shirye-shirye sosai.

Labarin zai ba da fahimtar yadda ake fara lissafin da ƙima a Java ta amfani da hanyoyi da ɗakunan karatu daban-daban.

Kara karantawa

A cikin Java, yin aiki tare da rafuffuka da kirtani muhimmin bangare ne na aikin yau da kullun na mai haɓakawa. Ayyukan ajin StringJoiner a cikin wannan mahallin ba za a iya raina aikin ba. An gabatar da shi a cikin Java 8, StringJoiner aji ne mai amfani wanda ke gina jerin haruffan da aka raba ta hanyar mai iyaka kuma zaɓin rufe shi da prefix da kari. Wannan yana taimakawa wajen cimma ayyuka kamar haɗa rafi na kirtani ko alamu ta mai iyakancewa, musamman lokacin aiki tare da Streams API.

Wannan kayan aiki, wanda aka gina a ƙarƙashin kunshin java.util, yana nuna sauƙi, inganci, da sassauƙa, don haka ya mai da shi kayan aiki mai mahimmanci ga masu haɓakawa. Ajin StringJoiner yana kawar da ƙaƙƙarfan tsari na sarrafa iyakoki da hannu, yana rage yuwuwar kurakurai.

Kara karantawa

A matsayin ƙwararren Mai Haɓaka Java kuma ƙwararren masani na salon, galibi ana ɗawainiyar mu da ƙirƙirar mafita na musamman ga matsaloli masu rikitarwa. Ɗayan irin wannan matsalar ita ce zaɓin bazuwar daga ƙidayar (Enum) a Java. Wataƙila kun riga kun yi hasashe cewa babu wata hanyar da aka gina a cikin Java da ke ba da wannan aikin kai tsaye - fasalin gama gari a cikin harsuna kamar Python. Duk da wannan, Java yana ba mu kayan aikin da suka dace don juya namu mafita.

Ƙididdigar, jaruman da ba a rera su ba na shirye-shirye da yawa, ainihin nau'i ne wanda filinsa ya ƙunshi ƙayyadaddun tsari. Yawancin lokaci muna so mu zaɓi ƙima daga wannan saitin. Manufar wannan labarin shine a kwatanta wannan tsari.

Kara karantawa

Rubuta labarin mai faɗi game da yadda ake bincika idan an kunna wuri akan na'urar Android na iya buƙatar cikakkiyar fahimtar shirye-shiryen Java da kuma amfani da ɗakunan karatu na Android daban-daban. Don haka, bari mu shiga cikin wannan.

A cikin shimfidar wuri na aikace-aikacen wayar hannu na zamani, samun damar wurin mai amfani ya zama mahimmanci don samar da keɓaɓɓen gogewa dangane da matsayin yanki na mai amfani. Wannan aikin yana da yawa a cikin na'urori masu ƙarfi da Android. Koyaya, tantance ko an kunna wurin ko a'a lamari ne mai mahimmanci shima.

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);
    }
}

Fahimtar lambar

Lambar da aka bayar a sama tana bincika idan an kunna sabis ɗin wurin akan kowace na'urar Android ta manyan matakai biyu:

- Idan nau'in na'urar KitKat ne ko sama, yana ƙoƙarin samun saitin yanayin wuri kuma yana tabbatar da ko ban da 'Yanayin Wuri'. Idan haka ne, yana tabbatar da cewa an kunna wurin.
- Don na'urorin da ke gudana akan nau'ikan da suka girmi KitKat, yana samun jerin masu ba da izini da kuma bincika idan babu komai a ciki. Idan lissafin bai fanko ba, an tabbatar da cewa an kunna wurin.

Matsayin Dakunan karatu da Ayyuka daban-daban

A cikin wannan lambar, mun yi amfani da wasu takamaiman ayyuka da ɗakunan karatu, da farko daga Kit ɗin Haɓaka Android:

• Gina.VERSION.SDK_INT: Wannan fili ne wanda ke riƙe da nau'in SDK na dandamali a halin yanzu yana aiki akan na'urar.
• Saituna.Amintacce: Wannan aji ne wanda ke kula da samun dama ga amintattun saitunan tsarin duniya, da farko saitin tsarin da ke shafar sirrin mai amfani.
• Saituna.Secure.getInt: Wannan hanyar tana dawo da amintaccen ƙimar saitin lamba don sunan da aka bayar.
• Saituna.Amintacce.LOCATION_MODE: Ana amfani da wannan don samun saitin yanayin wuri na yanzu.
• Saituna.Amintacce.LOCATION_PROVIDERS_ALLOWED: Yana samun jerin masu ba da wurin da aka yarda.

Kara karantawa

Linear Interpolation, wanda aka fi sani da Lerp, hanya ce da ake amfani da ita don ƙididdige maki da ke tsakanin wasu maki biyu akan layi ko lankwasa. Ana amfani da wannan fasaha sosai a fagage daban-daban kamar zanen kwamfuta da haɓaka wasan. A cikin wannan labarin, za mu zurfafa zurfi cikin abin da Lerp yake da kuma yadda ake aiwatar da shi a Java.

Kara karantawa

Tabbas, na fahimci bukatunku. Zan rubuta labarin game da batun "Ba za a iya fara farawa aji org.codehaus.groovy.vmplugin.VMPluginFactory" gami da gabatarwa, bayani, bayanin lamba da amfani da masu kai.

Gabatarwa
Java yana ba masu haɓaka damar ƙirƙirar aikace-aikace iri-iri. Koyaya, galibi suna fuskantar kuskuren farawa gama gari - "Ba a iya fara farawa aji org.codehaus.groovy.vmplugin.VMPluginFactory." Wannan kuskure yawanci yana tasowa ne saboda ɓacewa ko rashin jituwa da Kit ɗin Ci gaban Java (JDK). Don ƙarin fahimta, yana da mahimmanci a nutse cikin zurfin wannan batu da ƙudurinsa.

Kara karantawa

Tabbas, bari mu fara da batun.

Gabatarwa

Linux iyali ne na tushen tushen tushen tsarin aiki kamar Unix waɗanda suka dogara akan Linux Kernel. Tsarin bincika nau'in Linux ɗin da kuke gudanarwa muhimmin sashi ne na kiyaye tsarin ku, kuma yana taimaka muku sarrafa sabuntawa da magance matsalolin yadda ya kamata. Wannan labarin zai jagorance ku kan yadda ake bincika sigar Linux ɗin ku kuma ku fahimci takamaiman abubuwan da ke cikin sigar

Kara karantawa

Fahimtar Canjin Tafiya zuwa Kiɗa a Java.

Mayar da ruwa zuwa kirtani a Java muhimmin al'amari ne na yaren shirye-shiryen Java, musamman ga shirye-shiryen da ke mu'amala da lissafin lissafi. Wani lokaci yana da mahimmanci a canza lambobi zuwa tsarin rubutu don nuna shi daidai ga mai amfani, adana su a cikin ma'ajin bayanai, ko sarrafa su ta wata hanya dabam.

Kara karantawa

Tabbas, bari mu fara da bayanin manufar shirye-shirye ta amfani da shirye-shiryen Java - toast, alal misali, saƙon sanarwa ne mai sauri wanda ke tashi, ya ɓace, kuma baya ba da zaɓi don yin hulɗa. Wannan kyakkyawan fasalin yana da yawa a aikace-aikacen Android.

Daurewar salon shine a yi la'akari da abin yabo a matsayin kayan haɗi wanda zai iya haɓaka kaya, amma ba zai rinjaye shi ba. Ana iya gani a taƙaice, yana haɓaka ƙwarewar mai amfani, amma baya buƙatar kulawar mai amfani daga abin da aka fi mayar da hankali, kamar nau'in 'yan kunne na sanarwa ko jakunkuna mai launin fata a cikin tarin monochrome.

Kara karantawa