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Video: Yuav ua li cas koj tshem ib txoj hlua builder?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2024-01-18 08:24
1) Clear StringBuilder los ntawm kev muab cov khoom tshiab
- pej xeem chav JavaStringBufferClearEmptyExample {
- public static void main( Txoj hlua args) {
- StringBuilder sbStr = null;
- for(int i = 1; i <= 5; i++){
- // meej cov ntsiab lus los ntawm iteration yav dhau los.
- sbStr = new StringBuilder ();
- sbStr. append(i);
- Qhov system. tawm. print(sbStr);
Tom qab ntawd, kuv yuav hloov StringBuilder rau txoj hlua li cas?
Txhawm rau hloov StringBuilder rau String tus nqi yooj yim hu rau toString() txoj hauv kev rau nws
- Instantiate chav StringBuilder.
- Ntxiv cov ntaub ntawv rau nws siv append() txoj kev.
- Hloov cov StringBuilder rau txoj hlua siv txoj kev toString().
Kuv yuav ua li cas thiaj paub yog tias kuv tus StringBuilder khoob? Txoj kev ntev ntawm cov StringBuilder lossis StringBuffer chav kawm rov qab qhov ntev ntawm cov kab ke ntawm cov cim nws tam sim no muaj. Raws li koj tuaj yeem pom hauv qhov piv txwv, mus kuaj yog tias tus StringBuilder yog khoob , tau qhov ntev ntawm lub StringBuilder khoom. Yog ntev yog 0, nws yog khoob , txwv tsis pub.
Tsis tas li ntawd, koj yuav tshem tawm ib yam dab tsi los ntawm txoj hlua hauv Java li cas?
Koj tuaj yeem siv txoj kev substring() ntawm java ua . lang. Txoj hlua chav rau tshem tawm thawj los yog tus cim kawg ntawm Txoj hlua hauv Java . Txoj kev substring() yog overloaded thiab muab ob peb versions uas tso cai rau koj mus tshem tawm tus cwj pwm los ntawm txhua txoj haujlwm hauv Java.
Qhov twg zoo dua StringBuffer lossis StringBuilder?
Txoj hlua yog immutable whereas StringBuffer thiab StringBuider yog cov chav kawm hloov tau. StringBuffer yog xov zoo thiab synchronized whereas StringBuilder tsis yog, yog vim li cas StringBuilder yog nrawm dua StringBuffer . Txoj hlua concat + tus neeg teb xov tooj siv sab hauv StringBuffer lossis StringBuilder chav kawm.
Pom zoo:
Yuav ua li cas koj pom cov subSet ntawm ib txoj hlua hauv Java?
Lub subset ntawm ib txoj hlua yog tus cwj pwm los yog pawg ntawm cov cim uas muaj nyob hauv txoj hlua. Tag nrho cov subsets ua tau rau ib txoj hlua yuav yog n(n+1)/2. Program: pej xeem chav kawm AllSubsets {public static void main(String[] args) {String str = 'FUN'; int len = str. int temp = 0;
Muaj pes tsawg txoj hauv kev koj tuaj yeem tsim txoj hlua hauv Java?
Muaj ob txoj hauv kev los tsim cov khoom siv String: Los ntawm txoj hlua literal: Java String literal yog tsim los ntawm kev siv ob nqe lus. Piv txwv li: String s = "Welcome"; Los ntawm lo lus tseem ceeb tshiab: Java String yog tsim los ntawm kev siv lo lus tseem ceeb "tshiab"
Koj yuav kuaj xyuas li cas yog ib txoj hlua nyob hauv array JavaScript?
Thawj lub tsev kawm ntawv qub txoj kev los txheeb xyuas yog tias ib txoj hlua lossis array muaj ib txoj hlua yog siv indexOf txoj kev. Yog hais tias cov hlua los yog array muaj cov hom phiaj txoj hlua txoj kev rov qab thawj cov cim qhia (txoj hlua) lossis cov khoom ntsuas (Array) ntawm qhov sib tw. Yog tias tsis muaj qhov sib tw pom indexOf rov qab -1
Dab tsi yog qhov txawv ntawm txoj hlua thiab hlua hauv C #?
Qhov sib txawv ntawm txoj hlua thiab hlua hauv C# Hauv C#, hlua yog ib qho alias rau cov hlua hlua hauv. NET moj khaum. Qhov sib txawv me me tsuas yog tias yog tias koj siv cov chav kawm String, koj yuav tsum tau import System namespace rau saum koj cov ntaub ntawv, thaum koj tsis tas yuav ua qhov no thaum siv txoj hlua lo lus tseem ceeb
Dab tsi yog txoj hlua siv los sib piv ob txoj hlua nrog ib leeg hauv C#?
Lub syntax ntawm strcmp() muaj nuj nqi yog: Syntax: int strcmp (const char * str1, const char * str2); strcmp() muaj nuj nqi yog siv los sib piv ob txoj hlua ob txoj hlua str1 thiab str2. Yog tias ob txoj hlua zoo ib yam ces strcmp() rov 0, txwv tsis pub, nws rov qab tus nqi tsis yog xoom