TechCodeview

Det useDelimiter() er en Java Scanner-klassemetode, som bruges til at indstille afgrænsningsmønsteret for den scanner, som er i brug. Der er to forskellige typer Java useDelimiter() metode, som kan differentieres afhængigt af dens parameter. Disse er:

• Java Scanner useDelimiter (mønstermønster) metode
• Java Scanner useDelimiter(String pattern) Metode

Syntaks

Følgende er erklæringen af useDelimiter() metode:

java samlinger

 public Scanner useDelimiter(Pattern pattern) public Scanner useDelimiter(String pattern) 

Parameter

Vender tilbage

Det useDelimiter() metode returnerer dette scannerobjekt.

Undtagelser

AT

Kompatibilitetsversion

Java 1.5 og nyere

Eksempel 1

 import java.util.Scanner; public class ScannerUseDelimiterExample1 { public static void main(String args[]){ String str = 'JavaTpoint! 13 + 13.0 = 26.0 false '; //Create scanner with the specified String Object Scanner scanner = new Scanner(str); //Print String System.out.println('String: ' + scanner.nextLine()); //Change the delimiter of this scanner scanner.useDelimiter('vaT'); //Display the new delimiter System.out.println('New delimiter: ' +scanner.delimiter()); scanner.close(); } } 

Produktion:

 String: JavaTpoint! 13 + 13.0 = 26.0 false New delimiter: vaT 

Eksempel 2

 import java.util.Scanner; public class ScannerUseDelimiterExample2 { public static void main(String args[]){ // Initialize Scanner object Scanner scan = new Scanner('JavaTpoint/Abhishek/Male/22'); //Initialize the string delimiter scan.useDelimiter('/'); //Printing the tokenized Strings while(scan.hasNext()){ System.out.println(scan.next()); } scan.close(); } } 

Produktion:

vælg fra flere tabeller i sql

 JavaTpoint Abhishek Male 22 

Eksempel 3

 import java.util.Scanner; public class ScannerUseDelimiterExample3 { public static void main(String args[]){ String input = '1 fish 2 fish red fish blue fish'; // \s* means 0 or more repetitions of any whitespace character // fish is the pattern to find @SuppressWarnings('resource') Scanner sc = new Scanner(input).useDelimiter('\s*fish\s*'); System.out.println(sc.nextInt()); // prints: 1 System.out.println(sc.nextInt()); // prints: 2 System.out.println(sc.next()); // prints: red System.out.println(sc.next()); // prints: blue //close the scanner sc.close(); } } 

Produktion:

 1 2 red blue 

Eksempel 3

 import java.util.Scanner; public class ScannerUseDelimiterExample4 { public static void main(String args[]){ //Create scanner with the specified String Object Scanner scanner = new Scanner('55 13 + 13.0 = 26.0 77'); //Print String System.out.println('String: ' + scanner.nextLine()); //Change the delimiter of this scanner System.out.println('New delimiter: ' +scanner.useDelimiter('abcd')); scanner.close(); } } 

Produktion:

 String: 55 13 + 13.0 = 26.0 77 New delimiter: java.util.Scanner[delimiters=abcd][position=22][match valid=true][need input=false][source closed=true][skipped=false][group separator=,][decimal separator=.][positive prefix=][negative prefix=Q-E][positive suffix=][negative suffix=][NaN string=QNaNE][infinity string=Q∞E]