Scanner useDelimiter() method in Java with Examples

23 Nov, 2020
The useDelimiter(Pattern pattern) method of java.util.Scanner class sets this scanner’s delimiting pattern to the specified pattern.
Syntax: 
public Scanner useDelimiter(Pattern pattern)

Parameter: The function accepts a mandatory parameter pattern which specifies a delimiting pattern.
Return Value: The function returns this scanner.
Below programs illustrate the above function:
Program 1:  
Java
// Java program to illustrate the useDelimiter(Pattern Pattern)// method of Scanner class in Java import java.util.*;import java.util.regex.Pattern; public class GFG1 {    public static void main(String[] argv)        throws Exception    {         String s = "Geeksforgeeks has Scanner Class Methods";         // create a new scanner        // with the specified String Object        Scanner scanner = new Scanner(s);         // print a line of the scanner        System.out.println("Scanner String: \n"                           + scanner.nextLine());         // display the old delimiter        System.out.println("Old delimiter: "                           + scanner.delimiter());         // change the delimiter of this scanner        scanner.useDelimiter(Pattern.compile(".ll."));         // display the new delimiter        System.out.println("New delimiter: "                           + scanner.delimiter());         // close the scanner        scanner.close();    }}
Scanner String: 
Geeksforgeeks has Scanner Class Methods
Old delimiter: \p{javaWhitespace}+
New delimiter: .ll.




 
The useDelimiter(String pattern) method of java.util.Scanner class Sets this scanner’s delimiting pattern to a pattern constructed from the specified String.
Syntax:  
public Scanner useDelimiter(String pattern)

Parameter: The function accepts a mandatory parameter string pattern which specifies a delimiting pattern.
Return Value: The function returns this scanner.
Below programs illustrate the above function:
Program 1:  
Java
// Java program to illustrate the useDelimter(String Pattern)// method of Scanner class in Java import java.util.*; public class GFG1 {    public static void main(String[] argv)        throws Exception    {         String s = "Geeksforgeeks has Scanner Class Methods";         // create a new scanner        // with the specified String Object        Scanner scanner = new Scanner(s);         // print a line of the scanner        System.out.println("Scanner String: \n"                           + scanner.nextLine());         // print the old delimiter        System.out.println("Old Delimiter: "                           + scanner.delimiter());         // change the delimiter        scanner.useDelimiter("Wor");         // print the new delimiter        System.out.println("New Delimiter: "                           + scanner.delimiter());         // close the scanner        scanner.close();    }}
Scanner String: 
Geeksforgeeks has Scanner Class Methods
Old Delimiter: \p{javaWhitespace}+
New Delimiter: Wor




 
Reference: https://docs.oracle.com/javase/7/docs/api/java/util/Scanner.html#useDelimiter(java.lang.String) 
arorakashish0911
Java - util package
Java-Library
Java
Java
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