Scanner nextByte() method in Java with Examples
Last Updated :
12 Oct, 2018
The nextByte(radix) method of java.util.Scanner class scans the next token of the input as a Byte. If the translation is successful, the scanner advances past the input that matched. If the parameter radix is not passed, then it behaves similarly as nextByte(radix) where the radix is assumed to be the default radix.
Syntax:
public byte nextByte()
Parameters: The function accepts a parameter radix which is used to Byteerpret the token as a Byte value.
Return Value: This function returns the byte scanned from the input.
Exceptions: The function throws three exceptions as described below:
- InputMismatchException: if the next token does not matches the Byteeger regular expression, or is out of range
- NoSuchElementException: throws if input is exhausted
- IllegalStateException: throws if this scanner is closed
Below programs illustrate the above function:
Program 1:
import java.util.*;
public class GFG1 {
public static void main(String[] argv)
throws Exception
{
String s = "Gfg 9 + 6 = 12.0" ;
Scanner scanner = new Scanner(s);
while (scanner.hasNext()) {
if (scanner.hasNextByte()) {
System.out.println( "Found Byte value :"
+ scanner.nextByte());
}
else {
System.out.println( "Not found Byte value :"
+ scanner.next());
}
}
scanner.close();
}
}
|
Output:
Not found Byte value :Gfg
Found Byte value :9
Not found Byte value :+
Found Byte value :6
Not found Byte value :=
Not found Byte value :12.0
Program 2:
import java.util.*;
public class GFG1 {
public static void main(String[] argv)
throws Exception
{
String s = "Gfg 9 + 6 = 12.0" ;
Scanner scanner = new Scanner(s);
while (scanner.hasNext()) {
if (scanner.hasNextByte()) {
System.out.println( "Found Byte value :"
+ scanner.nextByte( 12 ));
}
else {
System.out.println( "Not found Byte value :"
+ scanner.next());
}
}
scanner.close();
}
}
|
Output:
Not found Byte value :Gfg
Found Byte value :9
Not found Byte value :+
Found Byte value :6
Not found Byte value :=
Not found Byte value :12.0
Program 3: To demonstrate InputMismatchException
import java.util.*;
public class GFG1 {
public static void main(String[] argv)
throws Exception
{
try {
String s = "Gfg 9 + 6 = 12.0" ;
Scanner scanner = new Scanner(s);
while (scanner.hasNext()) {
System.out.println( "Next Byte value :"
+ scanner.nextByte());
}
scanner.close();
}
catch (Exception e) {
System.out.println( "Exception thrown: " + e);
}
}
}
|
Output:
Exception thrown: java.util.InputMismatchException
Program 4: To demonstrate NoSuchElementException
import java.util.*;
public class GFG1 {
public static void main(String[] argv)
throws Exception
{
try {
String s = "Gfg" ;
Scanner scanner = new Scanner(s);
for ( int i = 0 ; i < 5 ; i++) {
if (scanner.hasNextByte()) {
System.out.println( "Found Byte value :"
+ scanner.nextByte());
}
else {
System.out.println( "Not found Byte value :"
+ scanner.next());
}
}
scanner.close();
}
catch (Exception e) {
System.out.println( "Exception thrown: " + e);
}
}
}
|
Output:
Not found Byte value :Gfg
Exception thrown: java.util.NoSuchElementException
Program 5: To demonstrate IllegalStateException
import java.util.*;
public class GFG1 {
public static void main(String[] argv)
throws Exception
{
try {
String s = "Gfg 9 + 6 = 12.0" ;
Scanner scanner = new Scanner(s);
scanner.close();
System.out.println( "Scanner Closed" );
System.out.println( "Trying to get "
+ "next Byte value" );
while (scanner.hasNext()) {
if (scanner.hasNextByte()) {
System.out.println( "Found Byte value :"
+ scanner.nextByte());
}
else {
System.out.println( "Not found Byte value :"
+ scanner.next());
}
}
}
catch (Exception e) {
System.out.println( "Exception thrown: " + e);
}
}
}
|
Output:
Scanner Closed
Trying to get next Byte value
Exception thrown: java.lang.IllegalStateException: Scanner closed
Reference: https://docs.oracle.com/javase/7/docs/api/java/util/Scanner.html#nextByte()
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