Scanner useRadix() method in Java with Examples

Last Updated : 10 Oct, 2018

The useRadix(radix) method of java.util.Scanner class sets this scanner's default radix to the specified radix. A scanner's radix affects elements of its default number matching regular expressions. Syntax:

public Scanner useRadix(int radix)

Parameters: The function accepts a mandatory parameter radix which specifies the radix to use when scanning numbers. Return Value: The function returns this scanner object. Exceptions: If the radix is less than Character.MIN_RADIX or greater than Character.MAX_RADIX, then an IllegalArgumentException is thrown. Below programs illustrate the above function: Program 1:

Java

// Java program to illustrate the // useRadix() method of Scanner class in Java  import java.util.*;  public class GFG1 {     public static void main(String[] argv)         throws Exception     {          try {              String s = "Geeksforgeeks has Scanner Class Methods";              // create a new scanner             // with the specified String Object             Scanner scanner = new Scanner(s);              // print the line of the scanner             System.out.println("String:\n"                                + scanner.nextLine());              // display the Old radix             System.out.println("\nOld Radix: "                                + scanner.radix());              // change the radix             // of the scanner to 12             scanner.useRadix(12);              // display the new radix             System.out.println("\nNew Radix: "                                + scanner.radix());              // close the scanner             scanner.close();         }          catch (IllegalArgumentException e) {             System.out.println("Exception thrown : " + e);         }     } }

Output:

  String:  Geeksforgeeks has Scanner Class Methods    Old Radix: 10    New Radix: 12

Program 2: Exception demonstrated

Java

// Java program to illustrate the // useRadix() method of Scanner class in Java  import java.util.*;  public class GFG1 {     public static void main(String[] argv)         throws Exception     {          try {              String s = "Geeksforgeeks has Scanner Class Methods";              // create a new scanner             // with the specified String Object             Scanner scanner = new Scanner(s);              // print the line of the scanner             System.out.println("String:\n"                                + scanner.nextLine());              // display the Old radix             System.out.println("\nOld Radix: "                                + scanner.radix());              // change the radix             // of the scanner to 64             scanner.useRadix(64);              // display the new radix             System.out.println("\nNew Radix: "                                + scanner.radix());              // close the scanner             scanner.close();         }          catch (IllegalArgumentException e) {             System.out.println("Exception thrown : " + e);         }     } }

Output:

  String:  Geeksforgeeks has Scanner Class Methods    Old Radix: 10  Exception thrown : java.lang.IllegalArgumentException: radix:64

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

Scanner useRadix() method in Java with Examples

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Scanner useRadix() method in Java with Examples

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