Java Scanner - hasNextLong() Method
The java.util.Scanner.hasNextLong() method returns true if the next token in the scanner's input can be interpreted as a long value in the default radix using the nextLong() method. The scanner does not advance past any input.
Syntax
public boolean hasNextLong()
Parameters
No parameter is required.
Return Value
Returns true if and only if the scanner's next token is a valid long value.
Exception
Throws IllegalStateException, if the scanner is closed.
Example:
In the example below, the java.util.Scanner.hasNextLong() method is used to check whether the scanner's next token is a valid long value or not.
import java.util.*;
public class MyClass {
public static void main(String[] args) {
//String to scan
String MyString = "Hello World 10 + 20 = 30.0";
//creating a Scanner
Scanner MyScan = new Scanner(MyString);
while(MyScan.hasNext()) {
//check if the next token is a long
//if yes, prints long value
if(MyScan.hasNextLong())
System.out.println("Long value is: "+ MyScan.nextLong());
//if the next token is not a long
else
System.out.println("No Long Value found: "+ MyScan.next());
}
//close the scanner
MyScan.close();
}
}
The output of the above code will be:
No Long Value found: Hello No Long Value found: World Long value is: 10 No Long Value found: + Long value is: 20 No Long Value found: = No Long Value found: 30.0
❮ Java.util - Scanner
