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Java Scanner useRadix() Method

The java Scanner useRadix(int radix) method sets this scanner's default radix to the specified radix.

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

public Scanner useRadix(int radix)

radix − The radix to use when scanning numbers

This method returns this scanner

IllegalArgumentException − if radix is out of range

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

package com.tutorialspoint;

import java.util.Scanner;

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 radix of this scanner
      scanner.useRadix(4);

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

      // 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 
4

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

package com.tutorialspoint;

import java.util.Scanner;

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 radix of this scanner
      scanner.useRadix(4);

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

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

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

3
3
4

The following example shows the usage of Java Scanner useRadix(int radix) method to set a radix of scanner. We've created a scanner object using properties.txt file. We've printed a line using nextLine() method and then set a radix 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 radix of this scanner
      scanner.useRadix(4);

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

      // 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
4

java_util_scanner.htm

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