Ko te hōtaka tuatahi i runga i Java - Hello World

I roto i te rohe o te whanaketanga i roto i te ako o te reo i hanga tona tono tuatahi ki te oha te ao. Noa'tu o koutou taiao motuhake, he kīanga i takea rite ki te hua o te hōtaka Hello World, ko te wāhanga tuatahi o te whanaketanga. I muri ko te tauira o te tono ohie i roto i te Java.

A faaineine ki te hanga i tō tono tuatahi

I mua i te hanga e koe tou Hello World i Java, e hiahia ana koe ki te tiki me te tāuta i te pūmanawa. Ko te mea tuatahi e hiahia ana koe, - JDK. Ko te huinga o taputapu kaiwhakawhanake tenei. Ko reira e minaminatia ki te tiki i te paetukutuku e pā ana o te kamupene Oracle. Ko te putanga hou o Java tenei ra - 8. Developer Toolkit he wātea mo te download me te tāuta i runga i ngä tüäpapa tata mohiotia katoa.

Na reira ko te kōwhiringa ki te whakamahi i tetahi te IDE, e ko, te taiao whanaketanga, hei tauira, te Eclipse me nga NetBeans, ranei tuhituhi waehere i roto i tetahi ētita kuputuhi. No te tapatahi, ka whakamahi i te tuhinga i te ara ngāwari - te whakamahi i Pukatuhi.

Hello World i roto i Java te whakamahi i te ētita kuputuhi ohie

Kei te riro te reira e kua te pūnaha kua tāuta JDK. Na e hiahia ana koe ki te whakahaere i te pukapuka tino mau i roto i te Windows ranei gedit ranei mitanano mo Linux. Ko taea ki tika whakaora, whakaingoatia te kōnae, hei tauira HelloWorld.java. Na, i roto i te mara kuputuhi, tomo i te torutoru rārangi ohie o te waehere:

piha HelloWorld {

}

Tenei mai te whakaingoa o te piha haapiiraa. Ko te whakaritenga reo Java, me huaina e ia te rite ki te kōnae iho, i te mea. Next mai i te Whītiki, Java huānga wetereo tohu te wahi tīmata te piha haapiiraa me pito. Roto ko reira inaianei tika ki te tautuhi i te tikanga e ka waiho te tahi mea ki te mahi i:

piha HelloWorld {

matua ([] Aho args) pateko tūmatanui kau {

}

}

Ko reira mai te tikanga matua te whakarewatanga o tetahi hōtaka i roto i te Java. Kupu matua tūmatanui - pūwhakakē uru ki te tohu e ko te reira tūmatanui, me te taea te whakamahi hea. Ki te ako ki te hapai i te reira, e taea te kitea i roto i te tuhinga e pā ana o te reo.

Next he pateko, e te tikanga e te tikanga pateko, e kore e i hanga e te karanga, me i te timatanga o te hōtaka. Te kau matua marau tohu e kore te matua e hoki mai tetahi raraunga, engari tika te tahi mea ki te mahi i.

Aho me ngā tohu i roto i te '[] tohu e taea te tango i te tikanga i runga i etahi uara tāuru, hei tauira, mō te tukatuka muri. He args ingoa tāupe homai te whai wāhi ki te tono mo taua mea ki nga raraunga i roto i te tikanga. E tano ia tapao e te matua, ka rite ki te piha haapiiraa, hanga e Whītiki, e whakaatu ana "ratou" rohe.

Well, inaianei tonu reira ki te tāpiri i te ara ki te whakaatu i nga hua o te hōtaka mahi:

piha HelloWorld {

matua ([] Aho args) pateko tūmatanui kau {

System.out.println ( «! Hello World»);

}

}

Tenei whakahau whakaatu noa te aho i roto i taiapa i runga i te mata. I te mutunga o te tauākī whakamahia e te kopipiko. Ko te kupu i roto i Java tohu te mutunga o te faaiteraa o te waehere te raina ranei. Ko te uara ki te kia putanga rite faahiti he hua te.

Rere a whakamatautau i te tono tuatahi

Hei whakahaere i te hua Hello Ao i roto i Java, e hiahia ana koe ki te haere ki te papatohu. I roto i te Windows, huaina ai ko te rārangi whakahau, a ki Linux - kāpeka. Kia i roto i te papatohu, e hiahia ana koe ki te tiki ki te HelloWorld.java kōnae ora i mua. Hei tauira, i roto i Windows, ka taea e te mea te ara C: \ Java \ Hello. Na ka tomo noa te papatohu whakahau cd C: \ Java \ Hello. Whakatere ki te kōpaki me te kōnae hōtaka, me tuatahi tahuri koe i te reira ki te bytecode. Ki te mahi i tenei, te whakamahi i te hanganga e whai ake nei:

javac HelloWorld.java

I muri i taua hiahia ana koe ki te whakahaere i te piha haapiiraa hua mo te mahi. Hoki tenei, rawa, i reira te mea he rōpū motuhake:

java HelloWorld.

I runga i te mata papatohu kia puta te hua o te Hello World i Java - te oha o te ao.

mutunga

Papatonotanga i roto i te Java - he mahi rawa ngā, me te whai hua. i waea pūkoro ohie ki teihana tūmau nui - e taea ki te rere i runga i te momo o ngā pūrere te tūāpapa ko. He maha papa matotoru hoki Ipurangi nui rite te tūāpapa matua te whakamahia Java te ki te tukatuka tono tūmau. Ka rite ki te mea i tuhituhia i roto i te waehere, a ki te pūnaha whakahaere Android inaianei rongonui. A ki te au o te whanaketanga, rite ia, i roto i te Java kua he heke mai nui.