Ukukhangela ukuba imitya emibini iyalingana na kwi-bash scripting, sebenzisa i-bash ukuba isitatimenti kwaye kabini ilingana no == umsebenzisi. Ukukhangela ukuba imitya emibini ayilingani na ngokushicilelweyo kwe-bash, sebenzisa i-bash ukuba ingxelo kwaye ayilingani no-!= umsebenzisi.
Uthelekisa njani imitya emibini engalinganiyo?
Umtya weJava uyalingana () Indlela
Indlela elinganayo () ithelekisa imitya emibini, kwaye ibuyisela inyani ukuba imitya iyalingana, kwaye ayiyonyani ukuba akunjalo. Icebiso: Sebenzisa i thelekisaKu () indlela ukuthelekisa imitya emibini ngokwezichazi-magama.
Ukubeka njani ukungalingani kwiskripthi seqokobhe?
=' Umqhubi : Ayilingananga nomsebenzisi wokubuyisela inyani ukuba ii-operands ezimbini azilingani kungenjalo ibuyisela bubuxoki. '<' Umsebenzisi : Ngaphantsi kunokubuyisela inyani ukuba i-operand yokuqala iyilees kuneyesibini kwaye enye ibuyisela bubuxoki.
Ngaba ungasebenzisa == ukuthelekisa imitya?
Kumtya, i == umsebenzisi usetyenzisiwe ukuthelekisa ireferensi yeentambo ezinikiweyo, kuxhomekeke ekubeni zibhekisa kwizinto ezifanayo. Xa uthelekisa iintambo ezimbini usebenzisa == umqhubi, iya kubuya iyinyani ukuba iiguquguquko zemitya zikhomba kwinto enye ye-java. Kungenjalo, iya kubuya bubuxoki .
Ngowuphi le miyalelo ilandelayo onokuyisebenzisa ukujonga ukuba imitya emibini iyalingana?
Ungayisebenzisa abaqhubi abalinganayo = kunye == ukujonga ukuba imitya emibini iyalingana. Kufuneka usebenzise isithuba esinye phambi nasemva kwe == kunye = nabaqhubi.
Yintoni umahluko phakathi == kunye nokulinganisa ()?
Ngamagama alula, == ijonga ukuba zombini izinto zalatha kwindawo yememori enye ngelixa . Equals() ivavanya ukuya kuthelekiso lwamaxabiso kwizinto. Ukuba iklasi ayikhuphi indlela yeequals, ngoko ngokungagqibekanga isebenzisa iequals(Object o) indlela yolona didi lomzali lukufutshane oluthathe ngaphezulu le ndlela.
Ndiyithelekisa njani imitya emibini kumbhalo wokuchwetheza ukuba imeko?
"ukuba isitatimenti sochwethezo sithelekisa umtya" Ikhowudi impendulo
- var string1 = “Molo Hlabathi”;
- var string2 = “Molo hlabathi.”;
- ukuba (umtya1 === umtya2) {
- ikhonsoli. log(“Iintambo zokuthelekisa!” );
- }
- enye {
- ikhonsoli. log(“Iintambo azihambelani”);
- }
Yintoni i-$? Kwiskripthi se-bash?
$? -Imo yokuphuma yomyalelo wokugqibela owenziweyo. $0 -Igama lefayile yoshicilelo lwangoku. $# -Inani leengxoxo ezinikezelweyo kwiscript. $$ -Inani lenkqubo yeqokobhe langoku.
Yintoni i-$? Kwiskripthi seqokobhe?
$? yi umahluko okhethekileyo kwiqokobhe ofunda ubume bokuphuma bomyalelo wokugqibela owenziweyo. Emva kokuba umsebenzi ubuyile, $? inika imo yokuphuma yomyalelo wokugqibela owenziweyo kumsebenzi.
Kuthetha ukuthini == kwi-bash?
== yi-bash-specific alias for = , eyenza umtya (lexical) uthelekiso endaweni ka -eq uthelekiso lwamanani. (Isuka ngasemva isuka ePerl: amagama asebenzisa isimbo samagama ngamanani, ezomfuziselo zilexical.)
Uthelekisa njani imitya yesichazi-magama?
Indlela yokuthelekisaKu () isetyenziselwa ukuthelekisa imitya emibini ngokwezichazimagama kwiJava.
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Ibuyisela amaxabiso alandelayo:
- ukuba (umtya1 > umtya2) ubuyisela ixabiso elilungileyo.
- ukuba yomibini imitya iyalingana ngokwezichazi-magama. oko kukuthi(umtya1 == umtya2) ubuyisela u-0.
- ukuba (umtya1 < umtya2) ibuyisela ixabiso elingalunganga.
Ndingazijonga njani ukuba iintambo ezimbini zineempawu ezifanayo?
Indlela yesi-2 (Bala abalinganiswa)
- Yenza uluhlu lwezibalo zobungakanani obungama-256 kuzo zombini iintambo. Qalisa onke amaxabiso kuluhlu lokubala njengo-0.
- Phinda ngonobumba ngamnye wayo yomibini imitya kwaye unyuse ubalo lonobumba kuluhlu oluhambelanayo lokubala.
- Thelekisa uluhlu lwamanani. Ukuba zombini izintlu zokubala ziyafana, ngoko buyisela inyaniso.
Uthelekisa njani imitya emibini kwiluphu?
Sebenzisa indlela elinganayo () ukujonga ukuba imitya emi-2 iyafana. Indlela ye-equal () yi-case-sensitive, okuthetha ukuba umtya "HELLO" uthathwa njengowahlukileyo kumtya "molo". Umsebenzi == akasebenzi ngokuthembekileyo ngeentambo. Sebenzisa == ukuthelekisa amaxabiso amandulo afana ne-int kunye ne-char.