Java.util.Scanner.nextByte() Method



The java.util.Scanner.nextByte(int radix) method scans the next token of the input as a byte. This method will throw InputMismatchException if the next token cannot be translated into a valid byte value as described below. If the translation is successful, the scanner advances past the input that matched.


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

public byte nextByte(int radix)


  • radix -- the radix used to interpret the token as a byte value

Return Value

This method returns the byte scanned from the input


  • InputMismatchException -- if the next token does not match the Integer regular expression, or is out of range

  • NoSuchElementException -- if the input is exhausted

  • IllegalStateException -- if this scanner is closed


The following example shows the usage of java.util.Scanner.nextByte() method.

package com.tutorialspoint;

import java.util.*;

public class ScannerDemo {

   public static void main(String[] args) {

   String s = "Hello World! 3 + 3.0 = 6 true";

   // create a new scanner with the specified String Object
   Scanner scanner = new Scanner(s);

   // find the next Byte token and print it
   // loop for the whole scanner
   while (scanner.hasNext()) {

   // if the next is byte with radix 7, print found and the byte
   if (scanner.hasNextByte()) {
   System.out.println("Found :" + scanner.nextByte(7));

   // if a Byte is not found, print "Not Found" and the token
   System.out.println("Not Found :" +;

   // close the scanner

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

Not Found :Hello
Not Found :World!
Found :3
Not Found :+
Not Found :3.0
Not Found :=
Found :6
Not Found :true