Tababarkaan, waxaan ku baran doonaa sida loogu beddelo xargaha Java oo loo beddelo nooca xogta: >
> Waxaan baran doonnaa inaan isticmaalno hababka soo socda si aan xarigga ugu beddelno labanlaab. qiimaha Java:>- >Double.parseDouble(String) >Double.valueOf Labada cusub (String s) >
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Qaababka Loo Beddelo Xargaha Java Si loo labanlaabo
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Waxaa jira xaalado gaar ah oo barnaamijkeena Java ay tahay in aan ku samayno nooc ka mid ah hawlgalada xisaabaadka ee qiimaha nambarada sida xisaabinta biilka, xisaabinta dulsaarka lacagta dhigaalka, iwm. Laakin waxa la heli karo barnaamijkan qaabka qoraalka sida Java String nooca xogta .
>Tusaale ahaan, ee xisaabinta biilasha raashinka - qiimaha badeecada iyo tirada cutubyada la soo iibsaday waxay u imanayaan soo gelis ahaan Laga soo bilaabo goobta qoraalka ee bogga internetka ama aagga qoraalka ee bogga shabakadda oo ah qaabka qoraalka sida Java String nooca xogta. Xaaladahan oo kale, marka hore waa inaan u beddelnaa Xadhigan si aan u soo saarno tirooyinka Java premitive data type double .
>Aan si faahfaahsan mid mid u aragno hababka kala duwan. >
#1) Double.parseDouble() Habka
parseDouble() Habka waxaa bixiya fasalka Double. Laba-jibbaaran waxa loo yaqaan fasalka duubista marka ay ku duubto qiimaha nooca hore labanlaab ee shayHoos: >
Xarig cayiman.
Halkan, 'str' halbeeggu waa Xarig ka kooban matalaadda qiimaha labanlaabka ah ee la kala saarayo oo soo celinaya labanlaabka qiimaha uu matalo doodda.
>Tani Habka waxa uu tuurayaa ka Reeban NumberFormatException marka Xadhiggu aanu ku jirin laba-jibbaaran masalo ah.Tusaale ahaan, aan tixgelinno dhacdo marka aan rabno in aan xisaabino qiimaha ka dib markii aan helno qiimo dhimis qiimihii asalka ahaa ee alaabta
Taas awgeed, qiyamka wax gelinta sida qiimihii asalka ahaa ee shayga iyo qiimo dhimista waxay ka imanayaan nidaamka biilkaaga qoraal ahaan waxaana rabnaa inaanu samayno hawlgal xisaabeed qiimayaashan si loo xisaabiyo qiimaha cusub ka dib markii laga jaray qiimo dhimista qiimihii asalka ahaa.
Aan aragno sida loo isticmaalo Double.parseDouble() habka loo kala saaro qiimaha String si loo labanlaabo koodka muunada ee soo socda: 3>
package com.softwaretestinghelp; /** * This class demonstrates sample code to convert string to double java program * using Double.parseDouble() method * * @author * */ public class StringToDoubleDemo1 { public static void main(String[] args) { // Assign "500.00" to String variable originalPriceStr String originalPriceStr = "50.00D"; // Assign "30" to String variable originalPriceStr String discountStr = "+30.0005d"; System.out.println("originalPriceStr :"+originalPriceStr); System.out.println("discountStr :"+discountStr); // Pass originalPriceStr i.e. String “50.00D” as a parameter to parseDouble() // to convert string 'originalPriceStr' value to double // and assign it to double variable originalPrice double originalPrice = Double.parseDouble(originalPriceStr); // Pass discountStr i.e. String “30.005d” as a parameter to parseDouble() // to convert string 'discountStr' value to double // and assign it to double variable discount double discount = Double.parseDouble(discountStr); System.out.println("Welcome, our original price is : $"+originalPrice+""); System.out.println("We are offering discount :"+discount+"%"); //Calculate new price after discount double newPrice = originalPrice - ((originalPrice*discount)/100); //Print new price after getting discount on the console System.out.println("Enjoy new attractive price after discount: $"+newPrice+""); } } Waa kan soo-saarka barnaamijka:
asalka ahPriceStr :50.00D
discountStr waa : $50.0
Waxaan bixinaynaa qiimo dhimis:30.0005%
Ku raaxayso qiimo cusub oo soo jiidasho leh ka dib qiimo dhimis qiime labanlaab ahloo gudbiyay hab-beegtida parseDouble() qiimuhuna waxa loo qoondeeyay labanlaab doorsoomiyaha asalka ah.
double originalPrice = Double.parseDouble(originalPriceStr);
parseDouble() habka waxa uu u rogaa qiimaha String labanlaab waxana uu meesha ka saaraa "+" ama "-" iyo 'D',' d'.
Hadaba, marka aan ku daabacno originalPrice console-ka:
System.out.println("Welcome, our original price is : $"+originalPrice+""); Soosaarka soo socda ayaa lagu soo bandhigi doonaa console-ka: >
>Soo dhawoow, Qiimahayagii asalka ahaa waa: $50.0Si la mid ah, String discountStr = "+30.0005d"; Xadhiga "+30.0005d" waxaa loo rogi karaa labanlaab iyadoo la isticmaalayo habka parseDouble() sida:
double discount = Double.parseDouble(discountStr);
Hadaba, marka aan daabacno qiimo dhimista console-ka
System.out.println("We are offering discount :"+discount+"%");Wax soo saarka soo socda ayaa lagu soo bandhigi doonaa console:
We are offering discount :30.0005%
Intaa waxaa dheer, hawlgallada arithmetic waxaa lagu sameeyaa kuwan qiyamka tirada ee barnaamijka. Aynu eegno qaabka saxeexa hoose:
Habkan taagan waxa uu soo celinayaa shayga nooca xogta oo labanlaab leh oo leh labanlaab qiimaha kaas oo uu matalo xarriiqda la cayimay.
in la kala saaro oo soo celiso qiimaha labanlaabka ah ee ay matasho dooda tobanle.>Habkani waxa uu tuurayaa ka reebban NumberFormatExceptionmarka xadhiggu aanu ku jirin qiime tiro ahaan karaAan isku dayno inaan fahanno sida loo isticmaalo habkan Double.valueOf () anagoo kaashanayna barnaamijka muunada ee soo socda:>package com.softwaretestinghelp; /** * This class demonstrates sample code to convert string to double java program * using Double.valueOf() method * * @author * */ public class StringToDoubleDemo2 { public static void main(String[] args) { // Assign "1000.0000d" to String variable depositAmountStr String depositAmountStr = "1000.0000d"; // Assign "5.00D" to String variable interestRate String interestRateStr = "+5.00D"; // Assign "2" to String variable yearsStr String yearsStr = "2"; System.out.println("depositAmountStr :"+depositAmountStr); System.out.println("interestRateStr :"+interestRateStr); System.out.println("yearsStr :"+yearsStr); // Pass depositAmountStr i.e.String “1000.0000d” as a parameter to valueOf() // to convert string 'depositAmountStr' value to double // and assign it to double variable depositAmount Double depositAmount = Double.valueOf(depositAmountStr); // Pass interestRateStr i.e.String “5.00D” as a parameter to valueOf() // to convert string 'interestRateStr' value to double // and assign it to double variable discount Double interestRate = Double.valueOf(interestRateStr); // Pass yearsStr i.e.String “2” as a parameter to valueOf() // to convert string 'yearsStr' value to double // and assign it to double variable discount Double years = Double.valueOf(yearsStr); System.out.println("Welcome to ABC Bank. Thanks for depositing : $"+ depositAmount+" with our bank"); System.out.println("Our bank is offering attractive interest rate for 1 year :"+interestRate+"%"); //Calculate interest after 2 years on the deposit amount Double interestEarned = ((depositAmount*interestRate*years)/100); System.out.println("You will be receiving total interest after "+years+" is $"+interestEarned+""); } }>Waa kan barnaamijka Output:
depositAmountStr :1000.0000d
interestRateStr :+5.00D
yearsStr :2
Ku soo dhawaada Bangiga ABC Waad ku mahadsantahay inaad dhigato: $1000.0 bangigeena
>Bangigayagu waxa uu bixinayaa dulsaar soo jiidasho leh 1 sano 1>Halkan, waxaanu ku meelaynaynaa qiyamka doorsoomayaasha xargaha:>String depositAmountStr = "1000.0000d"; String interestRateStr = "+5.00D"; String yearsStr = "2";
Isticmaal habka valueOf() si aad ugu badasho qiyamkan labanlaab sida hoos ku cad.
Double depositAmount = Double.valueOf(depositAmountStr);
Waxaan isticmaalnaa isla qiimaha xisaabinta dheeraadka ah ee xisaabinta sida:
Double interestEarned = ((depositAmount*interestRate*years)/100);
#3) Qaab-dhismeedka jajab tobanle () Habka
Taas, waxaan marka hore soo saarnay tusaalaha fasalka NumberFormat oo isticmaalna habka parse () ee fasalka NumberFormat.
Aynu eegno habka saxeexa hoose:
>Public Number parse(String str) tuuray ParseException 3>
Qaabkani waxa uu kala saarayaa qoraalka la cayimay. Tani waxay isticmaashaa xadhig laga bilaabo booska bilowga waxayna soo celisaa lambarka.
Habkani wuxuu tuurayaa Ka-reebis ParseException haddi bilowga String uusan ku jirin masaal.
>> Aan aragno barnaamijka tusaalaha hoose. Koodhkan muunada ahi waxa uu kala saaraa xadhig qoraal ah oo la habeeyey oo ka kooban labanlaab qiimo iyada oo la isticmaalayo habka parse():
package com.softwaretestinghelp; import java.text.DecimalFormat; import java.text.NumberFormat; import java.text.ParseException; /** * This class demonstrates sample code to convert string to double java program * using DecimalFormat parse () method * * @author * */ public class StringToDoubleDemo3 { public static void main(String [] args) throws ParseException { // Assign "5,000,00.00" to String variable pointsString String pointsString = "5,000,00.00"; System.out.println("pointsString :"+pointsString); // Pass pointsString i.e. String “+5,000,00.00” as a parameter to // DecimalFormat.getNumberInstance(). parse() method // to convert string pointsString value to double // and assign it to double variable points NumberFormat num = DecimalFormat.getNumberInstance(); Number pointsNum = num.parse(pointsString); double points = pointsNum.doubleValue(); System.out.println("Congratulations ! You have earned :"+points+" points!"); } } Waa kan soo saarida barnaamijka:
pointsString:5,000,00.00
Hambalyo ! Waxaad kasbatay :500000.0 dhibcood!
>Halkan, qoraalka la qaabeeyey ayaa loo qoondeeyay doorsoomiyaha xargaha sida soo socota:
String pointsString = "5,000,00.00";
Qoraalkan la qaabeeyey "5,000,00.00" waa la gudbay. Sida dood u ah habka nambarka.parse()
Ka hor inta aan la abuurin NumberFormat tusaale ahaan iyadoo la isticmaalayo DecimalFormat. getNumberInstance () habka.
DecimalFormat.getNumberInstance() method. NumberFormat num = DecimalFormat.getNumberInstance(); Number pointsNum = num.parse(pointsString);
Marka, labanlaab Qiimaha waxa lagu soo celiyaa iyada oo loo yeedho doubleValue () habka sida hoos ku cad.
double points = pointsNum.doubleValue();
#4)Labale Cusub () Dhise
> String str)Public Double(String str) tuuray NumberFormatException >
Dhisiyuhu wuxuu dhisaa oo soo celiyaa shay labanlaab ah isagoo qiimihiisu yahay labanlaab nooca uu matalo Xarriiqda cayiman.
str waa xadhig loogu badali karo labanlaab
>Habkani waxa uu tuurayaa ka reeban oo loo yaqaan NumberFormatExceptionhadii xadhiggu aanu lahayn qiime tiro la miisaaman karo>Aan isku dayno inaan fahanno sida loo isticmaalo dhisaha Double (String str) annagoo kaashanayna barnaamijka muunada soo socda ee xisaabiya bedka goobada anagoo radius laba jibaaran marka hore String.
package com.softwaretestinghelp; /** * This class demonstrates sample code to convert string to double java program * using new Double(String str) constructor * * @author * */ public class StringToDoubleDemo4 { public static void main(String[] args) { // Assign "+15.0005d" to String variable radiusStr String radiusStr = "+15.0005d"; System.out.println("radiusStr :"+radiusStr); // Pass radiusStr i.e.String “+15.0005d” as a parameter to new Double() // to convert string radiusStr value to double // and assign it to double variable radius double radius = newDouble(radiusStr).doubleValue(); System.out.println("Radius of circle :"+radius+" cm"); //Calculate area of circle double area = (3.14*(radius*radius)); System.out.println("Area of circle :"+area+" cm"); } }Waa kan soo saarida barnaamijka: >
>radiusStr :+15.0005d
Barnaamijka kore, qiimaha meeraha goobada ayaa loo qoondeeyayDoorsoomiyaha xargaha:
String radiusStr = "+15.0005d";
Si loo xisaabiyo bedka goobada, radius waxa loo rogaa qiime labanlaab ah iyadoo la isticmaalayo dhisme Double() kaas oo soo celiya qiimaha nooca xogta ee labanlaabka ah. Dabadeed habka doubleValue() ayaa lagu baaqay si loo soo ceshado qiimaha taariikhda asalka ah labanlaab sida hoos ku cad.
double radius = new Double (radiusStr).doubleValue();
Fiiro gaar ah: Double(String str) dhisaha waa la jaray tan iyo Java 9.0. Taasi waa sababta uu Double u soo saaray bayaan kor ku xusan.
Haddaba, habkan hadda waa la door bidaa. Haddaba, waxaanu daboolnay dhammaan hababka loogu beddelo String Java oo loogu beddelo nooca xogta aasaasiga ah ee Java ee labanlaaban.
Aynu eegno raacitaanka qaar ka mid ah su'aalaha soo noqnoqda ee ku saabsan String to laablaabashada habka.3
Su'aalaha Inta Badan La Isweydiiyo
> Q #1) Miyaan u beddeli karnaa xargaha laba jibaaran ee Java? > Jawab:Haa ,gudaha Java, Xargaha laba-laabashada waxa lagu samayn karaa iyadoo la isticmaalayo hababka fasalka Java ee soo socda:- Double.parseDouble(String)
- Double.valueOf(String)6
- Qaabka jajab tobanle () >
- Labale (String s) cusub
Q #2 3>
Jawab: Java waxa uu bixiyaa habab kala duwan oo xadhigga loogu rogo labanlaab.
>>>Q #3) Labanlaab ma ku jiraa Java?
> Jawab: Haa . Java waxa ay bixisaa noocyo kala duwan oo xogta aasaasiga ah si ay u kaydiso qiimaha tirooyinka sida gaaban, int, double, iwm. double waa Java nooca xogta aasaasiga ah ee matalaaya nambar sabayn-point ah. Nooca xogtani waxay qaadataa 8 bytes si loo kaydiyo isagoo leh 64-bit oo sax ah. Nooca xogtani waa doorasho guud oo lagu matalo qiyamka jajab tobanlaha.Q #4) Waa maxay Scanner Java? >
>>Jawaab:Java waxa ay siisaa java.util.Scanner class si aad u hesho talobixin isticmaale. Waxa ay leedahay habab kala duwan oo lagu helo gelinta noocyada xogta ee kala duwan. Tusaale ahaan,xariiqa xiga() waxa loo isticmaalaa in lagu akhriyo nooca xogta String. Si loo akhriyo qiimaha labanlaabka xogta, waxay bixisaa habka xigaDouble().Gabagabo
> Casharradan, waxaan ku aragnay sida loogu beddelo nooca xogta String loona beddelo nooca xogta aasaasiga ah ee labanlaabka Java iyadoo la adeegsanayo fasalka soo socda hababka oo ay la socdaan tusaalooyin fudud.- Double.parseDouble(String)
- Double.valueOf(String)
- DecimalFormat parse()
- cusub Laba-jibaaran ( Xarig s )