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Java Scanner nextByte() Method with Example

Scanner Class nextByte() method: Here, we are going to learn about the nextByte() method of Scanner Class with its syntax and example.
Submitted by Preeti Jain, on March 26, 2020

Scanner Class nextByte() method

Syntax:

    public byte nextByte();
    public byte nextByte(int rad);

• nextByte() method is available in java.util package.
• nextByte() method is used to read the next token of the input as a byte value at the implicit radix (rad) of this Scanner object.
• nextByte(int rad) method is used to read the next token of the input as a byte value at the explicit or given radix (rad) of this Scanner object.
• These methods may throw an exception at the time of representing input as a byte.
  • InputMismatchException: This exception may throw when the next token of the input mismatch.
  • NoSuchElementException: This exception may throw when no such element exists
  • IllegalStateException: This exception may throw when this Scanner is not opened.
• These are non-static methods, it is accessible with class object & if we try to access these methods with the class name then we will get an error.

Parameter(s):

• In the first case, nextByte(),
  • It does not accept any parameter.
• In the second case, nextByte(int rad),
  • int rad – represents the radix used to manipulate the token as a byte.

Return value:

In both the cases, the return type of the method is byte, it retrieves the byte read from the input.

Example:

// Java program is to demonstrate the example
// of nextByte() of Scanner

import java.util.*;
import java.util.regex.*;

public class NextByte {
 public static void main(String[] args) {
  String str = "Java Programming! 3 * 8= 24 + b";
  byte b = 10;

  // Instantiates Scanner
  Scanner sc = new Scanner(str);

  while (sc.hasNext()) {
   // By using nextByte() method isto
   // return the next token as a 
   // byte in the default radix
   if (sc.hasNextByte()) {
    byte next_b = sc.nextByte();
    System.out.println("sc.nextByte()): " + next_b);
   }

   // By using nextByte(radix) is to return
   // the byte value with the given radix
   if (sc.hasNextByte()) {
    byte next_r = sc.nextByte(9);
    System.out.println("sc.nextByte(9)): " + next_r);
   }
   sc.next();
  }
  // Scanner closed
  sc.close();
 }
}

Output

sc.nextByte()): 3
sc.nextByte()): 24