Java Scanner nextLong() Method
Example
Print the value of every long integer in the string:
// Create a scanner object
Scanner myObj = new Scanner("A long is a number between -9,223,372,036,854,775,808 and 9,223,372,036,854,775,807");
// Print the value of every long in the scanner
while (myObj.hasNext()) {
if (myObj.hasNextLong()) {
System.out.println(myObj.nextLong());
} else {
myObj.next();
}
}
Definition and Usage
The nextLong() method returns the long value of the number that the next token represents. The token must represent a whole number between -9,223,372,036,854,775,808 and 9,223,372,036,854,775,807.
The scanner is able to interpret digit groupings, such as using a comma for separating groups of 3 digits. The format of the groupings depends on the locale settings of the scanner, which can be changed with the useLocale() method.
If the radix parameter is used, then it interprets numbers using the radix. For example, a radix of 16 would interpret numbers as hexadecimal (digits 0 to 9 and A to F). If the radix parameter is not used then it interprets numbers using the scanner's radix which is 10 by default, but it can be changed with the useRadix() method.
What is a token?
A token is a sequence of characters separated from other tokens by delimiters. The default delimiter is a block of whitespace characters but it can be changed with the useDelimiter() method.
Syntax
One of the following:
public long nextLong()public long nextLong(int radix)Parameter Values
| Parameter | Description |
|---|---|
| radix | Optional. Specifies the radix used to interpret numbers. The radix specifies how many different symbols can be used to represent a digit in a number. |
Technical Details
| Returns: | The long value of the number that the next token represents. |
|---|---|
| Throws: |
InputMismatchException - If the token does not represent a long type value.NoSuchElementException - If there are no more tokens in the scanner.IllegalStateException - If the scanner has been closed.
|
