Java Scanner hasNextDouble() Method
Example
Print the value of every floating point number in the string:
// Create a scanner object
Scanner myObj = new Scanner("The probability is 45.6 percent");
// Print the value of every floating point number in the scanner
while (myObj.hasNext()) {
if (myObj.hasNextDouble()) {
System.out.println(myObj.nextDouble());
} else {
myObj.next();
}
}
Definition and Usage
The hasNextDouble() method returns true if the next token represents a valid number.
The scanner is able to interpret digit groupings, such as using a comma for separating groups of 3 digits. The format of the groupings and the character used as a decimal point depend on the locale settings of the scanner, which can be changed with the useLocale() 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
public boolean hasNextDouble()Technical Details
| Returns: | A boolean value which is true if the next token represents a valid number. |
|---|---|
| Throws: | IllegalStateException - If the scanner has been closed. |
