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Java Scanner useDelimiter() Method

The java Scanner useDelimiter(Pattern pattern) method sets this scanner's delimiting pattern to the specified pattern.

Following is the declaration for java.util.Scanner.useDelimiter() method

public Scanner useDelimiter(Pattern pattern)

pattern − A delimiting pattern

This method returns this scanner

NA

The Java Scanner useDelimiter(String pattern) method Sets this scanner's delimiting pattern to a pattern constructed from the specified String.

Following is the declaration for java.util.Scanner.useDelimiter() method

public Scanner useDelimiter(String pattern)

pattern − A string specifying a delimiting pattern

This method returns this scanner

NA

The following example shows the usage of Java Scanner useDelimiter(Pattern pattern) method to use a delimiter pattern for scanner. We've created a scanner object using a given string. We've printed a line using nextLine() method and then set a delimiter to print it. Then scanner is closed using close() method.

package com.tutorialspoint;

import java.util.Scanner;
import java.util.regex.Pattern;

public class ScannerDemo {
   public static void main(String[] args) {

      String s = "Hello World! 3 + 3.0 = 6.0 true ";

      // create a new scanner with the specified String Object
      Scanner scanner = new Scanner(s);

      // print a line of the scanner
      System.out.println(scanner.nextLine());

      // change the delimiter of this scanner
      scanner.useDelimiter(Pattern.compile(".ll."));

      // display the new delimiter
      System.out.println(scanner.delimiter());

      // close the scanner
      scanner.close();
   }
}

Let us compile and run the above program, this will produce the following result −

Hello World! 3 + 3.0 = 6.0 true 
.ll.

The following example shows the usage of Java Scanner useDelimiter(Pattern pattern) method to use a delimiter pattern for scanner. We've created a scanner object using System.in class. We've printed a line using nextLine() method and then set a delimiter to print it. Then scanner is closed using close() method.

package com.tutorialspoint;

import java.util.Scanner;
import java.util.regex.Pattern;

public class ScannerDemo {
   public static void main(String[] args) {

      // create a new scanner with the System.in class
      Scanner scanner = new Scanner(System.in);

      // print a line of the scanner
      System.out.println(scanner.nextLine());

      // change the delimiter of this scanner
      scanner.useDelimiter(Pattern.compile(".ll."));

      // display the new delimiter
      System.out.println(scanner.delimiter());

      // close the scanner
      scanner.close();
   }
}

Let us compile and run the above program, this will produce the following result −

Hello World
Hello World
.ll.

The following example shows the usage of Java Scanner useDelimiter(String pattern) method to use a delimiter pattern for scanner. We've created a scanner object using properties.txt file. We've printed a line using nextLine() method and then set a delimiter to print it. Then scanner is closed using close() method.

package com.tutorialspoint;

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;

public class ScannerDemo {
   public static void main(String[] args) throws FileNotFoundException {

      // create a new scanner with a file as input
      Scanner scanner = new Scanner(new File("properties.txt"));

      // print a line of the scanner
      System.out.println(scanner.nextLine());

      // change the delimiter of this scanner
      scanner.useDelimiter(".ll.");

      // display the new delimiter
      System.out.println(scanner.delimiter());

      // close the scanner
      scanner.close();
   }
}

Assuming we have a file properties.txt available in your CLASSPATH, with the following content. This file will be used as an input for our example program −

Hello World! 3 + 3.0 = 6

Let us compile and run the above program, this will produce the following result −

Hello World! 3 + 3.0 = 6
.ll.

java_util_scanner.htm

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