Java Scanner nextByte() Method

The nextByte() is a Java Scanner class method which is used to scan the next token of the input as a Byte. There is two different types of Java nextByte() method which can be differentiated depending on its parameter. These are:

Java Scanner nextByte() Method
Java Scanner nextByte(int radix) Method

nextByte() Method

This is a Java Scanner class method which is used to scan the next token of the input as a Byte in the default radix.

nextByte(int radix) Method

This is an inbuilt method of Java Scanner class which is used to scan the next token of the input as a Byte in the specified radix.

Syntax

Following is the declaration of nextByte() method:

public byte nextByte()
public byte nextByte(int radix)

Parameter

DataType	Parameter	Description	Required/Optional
int	radix	It is used to interpret the token as a byte value.	Required

Returns

The nextByte() method returns the Byte value scanned from the input.

Exceptions

IllegalStateException- This method throws exception if the innvocation is done after the scanner has been closed.

IllegalArgumentException- It throws this exception if the specified radix is out of range.

InputMismatchException- It throws this exception if the next token does not match the Integer regular expression, or is out of range.

Compatibility Version

Java 1.5 and above

Example 1

import java.util.*;
public class ScannerNextByteExample1 {  
	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);
		System.out.print("Enter the Number you want: ");
	      Byte num = input.nextByte();
	      System.out.println("Output value: "+(num * (num + 2)) / 2);
	      input.close();
	      }
}

Output:

Enter the Number you want: 20
Output value: 220

Example 2

import java.util.*;
public class ScannerNextByteExample2 {  
	public static void main(String[] args) {
	     @SuppressWarnings("resource")
	     Scanner in = new Scanner(System.in);
           Byte a, b, x;
           System.out.print("Enter Value of a: ");
           a = in.nextByte();       
           System.out.print("Enter Value of x: ");
           x = in.nextByte();
           System.out.print("Enter Value of b: ");
           b = in.nextByte();
                
           if (a >= b) {
               System.out.println("Output: "+a);
               return;
           }
           while (a <= b) {
               if (a + x >= b) {
                   System.out.println("Output: "+b);
                   return;
               }            
           }
           in.close();
	     }
}

Output:

Enter Value of a: 55
Enter Value of x: 66
Enter Value of b: 88
Output: 88

Example 3

import java.util.*;
public class ScannerNextByteExample3 {  
	public static void main(String[] args) {
		String str = "JavaTpoint.com 13 + 13 = 26.0 false";
	      Scanner scan = new Scanner(str);
	      while (scan.hasNext()) {
	         //If the next is byte, print found and the byte
	         if (scan.hasNextByte()) {
	            System.out.println("Found :" + scan.nextByte());
	         }
	         System.out.println("Not Found :" + scan.next());
	      }
	      scan.close();
	      }
}

Output:

Not Found :JavaTpoint.com
Found :13
Not Found :+
Found :13
Not Found :=
Not Found :26.0
Not Found :false

Example 4

import java.util.*;
public class ScannerNextByteExample4 {  
	public static void main(String[] args) {
		//Initialize the scanner
		Scanner scan = new Scanner("55 35 -55 75 51 -7A");
		while(scan.hasNext()){
			//Get the Byte Tokens
			System.out.println(scan.nextByte(16));
		}
		scan.close();
	}
}

Output:

Example 5

import java.util.*;
public class ScannerNextByteExample5 {  
	public static void main(String[] args) {	
	    String str = " 22 Java 33 true";
	    Scanner scanner = new Scanner(str);
	    while (scanner.hasNext()) {
	       System.out.println("Not Found : " + scanner.next());
	       if (scanner.hasNextByte()) {
	          System.out.println("Found : " + scanner.nextByte(2050));
	       }
	    }
	    scanner.close();
	}
}

Output:

Not Found : 22
Not Found : Java
Exception in thread "main" java.lang.IllegalArgumentException: radix:2050
	at java.base/java.util.Scanner.setRadix(Scanner.java:1368)
	at java.base/java.util.Scanner.nextByte(Scanner.java:1998)
	at myPackage.ScannerNextByteExample5.main(ScannerNextByteExample5.java:10)

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