El método useRadix(radix) de la clase java.util.Scanner establece la base predeterminada de este escáner en la base especificada. La raíz de un escáner afecta a los elementos de su número predeterminado que coincide con las expresiones regulares.
Sintaxis:
public Scanner useRadix(int radix)
Parámetros: la función acepta un parámetro radix obligatorio que especifica el radix que se utilizará al escanear números.
Valor de retorno: la función devuelve este objeto de escáner.
Excepciones: si la base es menor que Character.MIN_RADIX o mayor que Character.MAX_RADIX , se genera una IllegalArgumentException .
Los siguientes programas ilustran la función anterior:
Programa 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);
}
}
}
String: Geeksforgeeks has Scanner Class Methods Old Radix: 10 New Radix: 12
Programa 2: Excepción demostrada
// 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);
}
}
}
String: Geeksforgeeks has Scanner Class Methods Old Radix: 10 Exception thrown : java.lang.IllegalArgumentException: radix:64
Referencia: https://docs.oracle.com/javase/7/docs/api/java/util/Scanner.html#useRadix(int)