Ukuhlola ukuthi izintambo ezimbili ziyalingana yini ekubhalweni kwe-bash, sebenzisa i-bash uma isitatimende futhi ilingana kabili no-== opharetha. Ukuhlola ukuthi izintambo ezimbili azilingani yini ekubhalweni kwe-bash, sebenzisa i-bash uma isitatimende futhi ayilingani no-!= opharetha.
Uziqhathanisa kanjani izintambo ezimbili ezingalingani?
I-Java String ilingana() Indlela
Indlela ye-equals() iqhathanisa izintambo ezimbili, futhi ibuyisela iqiniso uma izintambo zilingana, futhi zingamanga uma kungenjalo. Ithiphu: Sebenzisa i- CompaniesTo() indlela ukuqhathanisa izintambo ezimbili ngokwezichazamazwi.
Ukubeka kanjani okungalingani kusikripthi segobolondo?
=’ I-Operator : Ayilingani nokubuyisela ku-opharetha kuyiqiniso uma ama-operands amabili engalingani uma kungenjalo ibuyisela amanga. '<' Umsebenzisi : Ngaphansi kokuthi u-opharetha ubuyisela iqiniso uma i-operand yokuqala iyilees kunomsebenzi wesibili kanti enye ibuyisela ingamanga.
Ungakwazi yini ukusebenzisa == ukuqhathanisa izintambo?
Ku-String, i- == opharetha isetshenzisiwe ekuqhathaniseni ireferensi yezintambo ezinikeziwe, kuye ngokuthi zibhekisela ezintweni ezifanayo. Uma uqhathanisa izintambo ezimbili usebenzisa == u-opharetha, izobuyela kuyiqiniso uma okuguquguqukayo kweyunithi yezinhlamvu kukhomba entweni efanayo ye-java. Uma kungenjalo, izobuya ingamanga .
Yimuphi kule miyalelo elandelayo ongawusebenzisa ukuhlola ukuthi izintambo ezimbili ziyalingana yini?
Ungasebenzisa opharetha abalinganayo = kanye == ukuhlola ukuthi izintambo ezimbili ziyalingana yini. Kufanele usebenzise isikhala esisodwa ngaphambi nangemuva kwama-opharetha == kanye =.
Uyini umehluko phakathi kwe-== nokulingana ()?
Ngamagama alula, == ihlola ukuthi zombili izinto zikhomba indawo yenkumbulo efanayo kanti . i-equals() ihlola ekuqhathanisweni kwamanani ezinto. Uma ikilasi lingayikhiphi indlela yokulinganisa, ngokuzenzakalelayo lisebenzisa indlela yokulinganisa(Into o) yekilasi labazali eliseduze elikhiphe le ndlela.
Ngiziqhathanisa kanjani izintambo ezimbili kumbhalo wokubhala uma isimo?
"uma umbhalo wohlobo lwesitatimende uqhathanisa iyunithi yezinhlamvu" Impendulo Yekhodi
- var string1 = “Sawubona Mhlaba”;
- var string2 = “Sawubona mhlaba.”;
- uma (i-string1 === string2) {
- ikhonsoli. log(“Amayunithi ezinhlamvu afanayo!” );
- }
- okunye {
- ikhonsoli. log(“Izintambo azifani”);
- }
Yini i-$? Ku-bash script?
$? -Isimo sokuphuma somyalo wokugcina owenziwe. $0 -Igama lefayela lombhalo wamanje. $# -Inani lama-agumenti anikezwe iskripthi. $$ -Inombolo yenqubo yegobolondo lamanje.
Yini i-$? Kuskripthi segobolondo?
$? kuyinto okuhlukile okukhethekile kugobolondo okufunda isimo sokuphuma somyalo wokugcina okhishiwe. Ngemva kokubuya komsebenzi, $? inikeza isimo sokuphuma somyalo wokugcina owenziwe kumsebenzi.
Kusho ukuthini == ku-bash?
== iyigama elithi bash -specific = , eyenza ukuqhathanisa kweyunithi yezinhlamvu (lexical) esikhundleni sokuqhathanisa kwezinombolo -eq. (Kuhlehlela emuva ku-Perl: abaqhubi besitayela samagama bayizinombolo, abangokomfanekiso banesichazamazwi.)
Uqhathanisa kanjani iyunithi yezinhlamvu zesichazamazwi?
Indlela yokuqhathanisaTo() isetshenziselwa ukuqhathanisa izintambo ezimbili ngokwe-lexicographically ku-Java.
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Ibuyisela amanani alandelayo:
- uma (i-string1 > string2) ibuyisela inani eliphozithivu.
- uma zombili izintambo zilingana ngokwesichazamazwi. ie(string1 == string2) ibuyisela u-0.
- uma (i-string1 < string2) ibuyisela inani eliyinegethivu.
Ngihlola kanjani ukuthi izintambo ezimbili zinezinhlamvu ezifanayo?
Indlela 2 (Bala izinhlamvu)
- Dala amanani afanayo kasayizi 256 kuzo zombili izintambo. Qalisa wonke amanani kumalungu afanayo wokubala njengo-0.
- Phinda ufunde lonke uhlamvu lwazo zombili izintambo futhi ukhuphule isibalo sohlamvu kumalungu afanayo wokubala ahambisanayo.
- Qhathanisa amanani afanayo. Uma womabili amalungu afanayo okubala afana, buyisela iqiniso.
Uziqhathanisa kanjani izintambo ezimbili kuluphu?
Sebenzisa indlela yokulinganisa () ukuhlola ukuthi izintambo ezi-2 ziyefana yini. Indlela ye-equals() izwela i-case-sensitive, okusho ukuthi iyunithi yezinhlamvu ethi "HELLO" ibhekwa njengehlukile kuyunithi yezinhlamvu ethi "sawubona". I- == opharetha ayisebenzi ngokuthembekile ngezintambo. Sebenzisa == ukuze uqhathanise amanani akudala njenge-int ne-char.