Yadda ake shigar Java a Ubuntu

Java ta samo asali ne daga Sun (wanda yanzu mallakar Oracle ne) a cikin 1992, kuma ya tashi ne daga buƙatar ƙirƙirar wani dandamali wanda zai ba da damar ci gaban lambar tushe ta duniya. Manufar ita ce ta inganta aikace-aikacen da za a iya ƙirƙirawa a cikin kowane tsarin aiki wanda ke da goyon bayan Java sannan a kashe shi a cikin wani ba tare da buƙatar canje-canje ba, wanda a cikin jargon aka san shi da WORA ("rubuta sau ɗaya gudu ko'ina", ko "rubuta sau ɗaya, aiwatar da ko'ina »).

Wannan shine yadda Java ta shiga cikin manyan tsarin aiki kamar Windows, Mac OS X (a wancan lokacin, MacOS) kuma tabbas Linux. A cikin wannan bayyananniyar harka, tare da isowa ga yawancin rikice-rikice, kodayake ba duk tsarin kunshin ke haɗa shi ta hanyar abokantaka ko bayar da sababbin sifofin ba. Kuma a cikin wasu sanannun sanannun lokuta kamar na Ubuntu, dole ne mu ɗauki laan hanyoyi don shigar da lokacin gudu na Java da SDK ɗinsa idan muka ga dama (ko muna buƙatar fara lambar haɓakawa).

Yanzu bari mu gani yadda ake girka java akan Ubuntu, wani abu da bashi da rikitarwa kwata-kwata, kodayake yana bukatar wasu matakai wadanda yakamata su bayyana, musamman tunda muma a halin yanzu muna da damar girka duka nau'ikan Oracle na Java - wato, hukuma daya da OpenJDK, wanda aka bunkasa ta hanyar al'umma kuma hakan ya fara ne a matsayin caca don gaba yayin da ba a bayyana matsayin rawar Java ba dangane da halin da take ciki. software kyauta.

Daidaita tsakanin su biyu ya kai kashi 99,9, amma ni kaina ina ganin cewa ga horon da zai kawo mana sauki idan muna son yin aiki a kamfanin ya dace mu daidaita da yadda zamu iya zuwa kayan aikin hukuma. Misali, a yanayin Java akwai amfani sosai don koyon amfani da su Netbeans ko Eclipse da amfani da Java na Oracle. Don haka, abu na farko shine a bincika idan ana girka distro dinmu yazo da OpenJDK:

java -version

Tsarin zai dawo da bayanan Sigar Java da muka girka, misali wani abu kamar 'OpenJDK Runtime Environment' idan muna da sigar OpenJDK. Idan haka ne lamarin, zamu iya cire shi ta:

sudo apt-get purge openjdk - \ *

Yanzu muna da cikakken tabbaci na cire duk abin da ya shafi shigarwar Java na baya, don farawa da mai tsabta. Mataki na farko shine ƙirƙirar manyan fayiloli ko kundayen adireshi wanda zamu shigar da sabon sigar, kuma wannan mai sauƙi ne:

sudo mkdir -p / usr / na gari / java

To dole ne mu yi zazzage Java SDK ba da kulawa ta musamman kan ko shi ne ya yi daidai da tsarin mu, ma’ana, 32 ko 64, tunda misali Java na ragowa 64 ba zai yi aiki daidai kan tsarin 32-bit ba kuma zai ba mu kurakurai iri daban-daban. Muna kwafin saukarwa zuwa babban fayil ɗin da muka ƙirƙira a cikin matakin da ya gabata, ta amfani da:

cp jdk-8-linux-x64.tar.gz / usr / na gida / java

Sannan mun sanya kanmu a cikin wannan kundin adireshi kuma mun cire shi:

tar -xvf jdk-8-linux-x64.tar.gz

Tare da wannan umarnin, da java sauke, kuma zai kasance cikin babban fayil din da muka kirkira a baya, wani abu kamar / usr / na gari / java / jdk8, kuma a ciki dukkan kananan folda da suke cikin fayil dinda muka zazzage.

Muna aiki da kyau, kuma akwai sauran saura kadan amma har yanzu muna da muhimmin mataki da zamu iya yi kuma shine sanya tsarin ya gano dokokin Java domin mu aiwatar dasu ba tare da mun shiga hanyar gaba daya zuwa gare su ba amma kawai ta hanyar buga takamaiman umarni, kamar su javako java. Ana kiran wannan 'ƙara zuwa hanyar' kuma yana da sauƙin aiwatarwa tunda dole ne mu canza abubuwan da ke cikin fayil ɗin / sauransu / bayanin martaba. Saboda wannan muna amfani da editan rubutu na abin da muke so, a harkata Gedit:

sudo gedit / sauransu / profile

kuma mun ƙara masu zuwa:

JAVA_HOME = / usr / na gari / java / jdk8
TAFARKI = $ PATH: $ HOME / bin: $ JAVA_HOME / bin
Fitar da JAVA_HOME
Fitar da HANYA

Muna adana canje-canje, kuma yanzu muna da thisara wannan shigarwar Java ɗin zuwa rumbun adana bayanan tsarinmu, wanda muke yi ta hanyar umarnin sabunta-abubuwa.

Da wannan umarnin muke sanar da tsarin cewa Oracle Java JRE, JDK da Java Webstart suna nan:

sudo sabunta-madadin -a girka "/ usr / bin / java" "java" "/ usr / local / java / jdk8 / bin / java" 1

sudo sabunta-madadin -a girka "/ usr / bin / javac" "javac" "/ usr / local / java / jdk8 / bin / javac" 1

sudo sabuntawa-madadin -a girka "/ usr / bin / javaws" "javaws" "/ usr / local / java / jdk8 / bin / javaws" 1

Yanzu bari saita Oracle Java azaman lokacin tafiyar tsoho na tsarin:

sudo sabunta-madadin-saita java / usr / local / java / jdk8 / bin / java

sudo sabunta-madadin-saita javac / usr / local / java / jdk8 / bin / javac

sudo sabunta-madadin-saita javaws / usr / na gida / java / jdk8 / bin / javaws

Shi ke nan, mun gama da shigarwa, kuma za mu iya tabbatar da hakan ta hanyar sake aiwatar da umarnin farko kuma mu tabbatar da abin da ya cece mu:

java-juyawa,

Kamar yadda za mu gani, za mu riga mu gudanar da aikin Oracle Java da aka sabunta zuwa sabon salo.

Informationarin bayani - Ubuntu na iya samun mafi kyawun abin bincike a duniya da naku, Netbeans a Ubuntu, Yadda ake girka IDE a cikin Ubuntu (I)