Java.util.Scanner.nextByte() Method



The java.util.Scanner.nextByte() method scans the next token of the input as a byte. An invocation of this method of the form nextByte() behaves in exactly the same way as the invocation nextByte(radix), where radix is the default radix of this scanner.


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

public byte nextByte()



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, print found and the byte
         if (scanner.hasNextByte()) {
            System.out.println("Found :" + scanner.nextByte());

         // 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