Java Scanner useDelimiter() Method

The useDelimiter() is a Java Scanner class method which is used to set the delimiting pattern of the Scanner which is in using. There is two different types of Java useDelimiter() method which can be differentiated depending on its parameter. These are:

Java Scanner useDelimiter(Pattern pattern) Method
Java Scanner useDelimiter(String pattern) Method

Syntax

Following is the declaration of useDelimiter() method:

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

Parameter

DataType	Parameter	Description	Required/Optional
Pattern	pattern	It is a delimiting pattern	Required
String	pattern	It is a string which specify the delimiting pattern.	Required

Returns

The useDelimiter() method returns this scanner object.

Exceptions

Compatibility Version

Java 1.5 and above

Example 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();
         }  
}

Output:

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

Example 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(); 
          }  
}   

Output:

JavaTpoint
Abhishek
Male
22

Example 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();     
         }  
}   

Output:

1
2
red
blue

Example 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();
         }  
}   

Output:

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=\QNaN\E][infinity string=\Q∞\E]

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