Scanner reset() method in Java with Examples

The reset() method of java.util.Scanner class resets this scanner. On resetting a scanner, it discards all of its explicit state information which may have been changed by invocations of useDelimiter(java.util.regex.Pattern), useLocale(java.util.Locale), or useRadix(int).

Syntax:

public Scanner reset()

Return Value: This function returns this scanner which has been reset.



Below programs illustrate the above function:

Program 1:

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// Java program to illustrate the
// reset() 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());
  
        // change the locale of this scanner
        scanner.useLocale(Locale.US);
  
        // change the radix of this scanner
        scanner.useRadix(30);
  
        System.out.println("\nBefore Reset:\n");
  
        // print the values before reset
        System.out.println("Radix: " + scanner.radix());
        System.out.println("Locale: " + scanner.locale());
  
        // reset
        scanner.reset();
  
        System.out.println("\nAfter Reset:\n");
  
        System.out.println("Radix: " + scanner.radix());
        System.out.println("Locale: " + scanner.locale());
  
        // close the scanner
        scanner.close();
    }
}

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Output:

Scanner String:
Geeksforgeeks has Scanner Class Methods

Before Reset:

Radix: 30
Locale: en_US

After Reset:

Radix: 10
Locale: en_US

Program 2:

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// Java program to illustrate the
// reset() method of Scanner class in Java
  
import java.util.*;
  
public class GFG1 {
    public static void main(String[] argv)
        throws Exception
    {
  
        String s = "Geeksforgeeks";
  
        // 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());
  
        // change the locale of this scanner
        scanner.useLocale(Locale.US);
  
        // change the radix of this scanner
        scanner.useRadix(12);
  
        System.out.println("\nBefore Reset:\n");
  
        // print the values before reset
        System.out.println("Radix: " + scanner.radix());
        System.out.println("Locale: " + scanner.locale());
  
        // reset
        scanner.reset();
  
        System.out.println("\nAfter Reset:\n");
  
        System.out.println("Radix: " + scanner.radix());
        System.out.println("Locale: " + scanner.locale());
  
        // close the scanner
        scanner.close();
    }
}

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Output:

Scanner String:
Geeksforgeeks

Before Reset:

Radix: 12
Locale: en_US

After Reset:

Radix: 10
Locale: en_US

Reference: https://docs.oracle.com/javase/7/docs/api/java/util/Scanner.html#reset()

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