An warware: fara lissafin da ฦ™ima

Tabbas, bari mu fara rubuta labarin.

ฦ˜addamar da jeri tare da ฦ™ima a Java aiki ne da ake buฦ™ata don masu haษ“akawa. Sau da yawa ana ganin cewa masu shirye-shiryen Java dole ne su magance ayyuka kamar ฦ™irฦ™irar jeri, ฦ™ara ฦ™ima 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 ฦ™ima na iya daidaita ayyukan shirye-shirye sosai.

Labarin zai ba da fahimtar yadda ake fara lissafin da ฦ™ima a Java ta amfani da hanyoyi da ษ—akunan karatu daban-daban.

Kara karantawa

An warware: Mai haษ—a igiya a cikin rafi

A cikin Java, yin aiki tare da rafuffuka da kirtani muhimmin bangare ne na aikin yau da kullun na mai haษ“akawa. 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 zaษ“in rufe shi da prefix da kari. Wannan yana taimakawa wajen cimma ayyuka kamar haษ—a rafi na kirtani ko alamu ta mai iyakancewa, musamman lokacin aiki tare da Streams API.

Wannan kayan aiki, wanda aka gina a ฦ™arฦ™ashin kunshin java.util, yana nuna sauฦ™i, inganci, da sassauฦ™a, don haka ya mai da shi kayan aiki mai mahimmanci ga masu haษ“akawa. Ajin StringJoiner yana kawar da ฦ™aฦ™ฦ™arfan tsari na sarrafa iyakoki da hannu, yana rage yuwuwar kurakurai.

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An warware: zaษ“i bazuwar enum

A matsayin ฦ™wararren Mai Haษ“aka Java kuma ฦ™wararren masani na salon, galibi ana ษ—awainiyar mu da ฦ™irฦ™irar mafita na musamman ga matsaloli masu rikitarwa. ฦŠayan irin wannan matsalar ita ce zaษ“in bazuwar daga ฦ™idayar (Enum) a Java. Wataฦ™ila 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.

ฦ˜ididdigar, jaruman da ba a rera su ba na shirye-shirye da yawa, ainihin nau'i ne wanda filinsa ya ฦ™unshi ฦ™ayyadaddun tsari. Yawancin lokaci muna so mu zaษ“i ฦ™ima daga wannan saitin. Manufar wannan labarin shine a kwatanta wannan tsari.

Kara karantawa

An warware: yadda ake bincika idan an kunna wurin aiki android

Rubuta labarin mai faษ—i game da yadda ake bincika idan an kunna wuri akan na'urar Android na iya buฦ™atar cikakkiyar fahimtar shirye-shiryen Java da kuma amfani da ษ—akunan 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 keษ“aษ“ษ“en gogewa dangane da matsayin yanki na mai amfani. Wannan aikin yana da yawa a cikin na'urori masu ฦ™arfi 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 ษ—in wurin akan kowace na'urar Android ta manyan matakai biyu:

- Idan nau'in na'urar KitKat ne ko sama, yana ฦ™oฦ™arin 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 ษ—akunan karatu, da farko daga Kit ษ—in Haษ“aka Android:

  • Gina.VERSION.SDK_INT: Wannan fili ne wanda ke riฦ™e 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 ฦ™imar 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

An warware: lep

Linear Interpolation, wanda aka fi sani da Lerp, hanya ce da ake amfani da ita don ฦ™ididdige 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 haษ“aka 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

An warware: An kasa fara class org.codehaus.groovy.vmplugin.VMPluginFactory

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 haษ“aka damar ฦ™irฦ™irar 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 ษ“acewa ko rashin jituwa da Kit ษ—in Ci gaban Java (JDK). Don ฦ™arin fahimta, yana da mahimmanci a nutse cikin zurfin wannan batu da ฦ™udurinsa.

Kara karantawa

An warware: duba sigar Linux

Tabbas, bari mu fara da batun.

Gabatarwa

Linux iyali ne na tushen tushen tushen tsarin aiki kamar Unix waษ—anda suka dogara akan Linux Kernel. Tsarin bincika nau'in Linux ษ—in 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 ษ—in ku kuma ku fahimci takamaiman abubuwan da ke cikin sigar

Kara karantawa

An warware: taso kan ruwa zuwa kirtani

Fahimtar Canjin Tafiya zuwa Kiษ—a 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

An warware: toast misali

Tabbas, bari mu fara da bayanin manufar shirye-shirye ta amfani da shirye-shiryen Java - toast, alal misali, saฦ™on sanarwa ne mai sauri wanda ke tashi, ya ษ“ace, kuma baya ba da zaษ“i don yin hulษ—a. Wannan kyakkyawan fasalin yana da yawa a aikace-aikacen Android.

Daurewar salon shine a yi la'akari da abin yabo a matsayin kayan haษ—i wanda zai iya haษ“aka kaya, amma ba zai rinjaye shi ba. Ana iya gani a taฦ™aice, yana haษ“aka ฦ™warewar mai amfani, amma baya buฦ™atar 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.

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