Java Scanner hasNextByte() Method

The hasNextByte() is a Java Scanner class method which is used to check the next token in this scanner's input can be interpreted as a byte value in the default radix or not. It returns true if it is interprated as a byte value, otherwise returns false. There is two different types of Java hasNextByte() method which can be differentiated depending on its parameter. These are:

Java Scanner hasNextByte() Method
Java Scanner hasNextByte(int radix) Method

hasNextByte() Method:

This is a Java Scanner class method which is used to check the next token in this scanner's input can be interpreted as a byte value in the default radix using the nextByte() method.

hasNextByte(int radix) Method:

This is an inbuilt method of Java Scanner class which is used to check the next token in this scanner's input can be interpreted as a byte value in the specified radix using the nextByte() method.

Syntax

Following is the declaration of hasNextByte() method:

public boolean hasNextByte()
public boolean hasNextByte(int radix)

Parameter

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

Returns

The hasNextByte() method returns true if and only if this scanner's next token is a valid byte value.

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.

Compatibility Version

Java 1.5 and above

Example 1

import java.util.Scanner;  
public class ScannerHasNextByteExample1 {  
     public static void main(String args[]){ 
    	   String str = "JavaTpoint.com 11 + 11 = 22.0";
         Scanner scanner = new Scanner(str);
         while (scanner.hasNext()) {
         //Check if the scanner's next token is a byte        
         System.out.println("Scan String: "+scanner.next());
         System.out.println("Result: "+scanner.hasNextByte());
         }
         scanner.close();
         }  
} 

Output:

Scan String: JavaTpoint.com
Result: true
Scan String: 11
Result: false
Scan String: +
Result: true
Scan String: 11
Result: false
Scan String: =
Result: false
Scan String: 22.0
Result: false

Example 2

import java.io.FileNotFoundException;
import java.util.Scanner;  
public class ScannerHasNextByteExample2 {  
	public static void main(String[] args) throws FileNotFoundException {
		String str = "Byte number is -112";
		//Create the scanner object
		Scanner scan = new Scanner(str);
		//Iterate through the file line by line
		while(scan.hasNext()){
			if(scan.hasNextByte()){
				System.out.println("Found a byte!");
			}
			scan.next();
		}
		scan.close();
	      }
} 

Output:

Found a byte!

Example 3

import java.util.Scanner;  
public class ScannerHasNextByteExample3 {  
     public static void main(String args[]){ 
    	   String str = "JavaTpoint.com 11 + 11 = 22.0";
         Scanner scanner = new Scanner(str);
         while (scanner.hasNext()) {
         // if the next is byte with radix 6, print found and the byte
         if (scanner.hasNextByte()) {
             System.out.println("Found :" + scanner.nextByte(6));
         }
         // if a Byte is not found, print "Not Found" and the token
         System.out.println("Not Found :" + scanner.next());
         }
         scanner.close();
         }  
} 

Output:

Not Found :JavaTpoint.com
Found :7
Not Found :+
Found :7
Not Found :=
Not Found :22.0

Example 4

import java.util.Scanner;  
public class ScannerHasNextByteExample4 {  
     public static void main(String args[]){ 
    	   String str = " 11 Java 11 + 11 = 22.0";
         Scanner scanner = new Scanner(str);
         while (scanner.hasNext()) {
         if (scanner.hasNextByte()) {
             System.out.println("Found :" + scanner.nextByte(598670));
         }
         // if a Byte is not found, print "Not Found" and the token
         System.out.println("Not Found :" + scanner.next());
         }
         scanner.close();
         }  
} 

Output:

Exception in thread "main" java.lang.IllegalArgumentException: radix:598670
	at java.base/java.util.Scanner.setRadix(Scanner.java:1368)
	at java.base/java.util.Scanner.nextByte(Scanner.java:1998)
	at myPackage.ScannerHasNextByteExample4.main(ScannerHasNextByteExample4.java:10)

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