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 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 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)
