Java.util.Scanner.nextLong() Method



The java.util.Scanner.nextLong(int radix) method scans the next token of the input as a long. This method will throw InputMismatchException if the next token cannot be translated into a valid long value as described below. If the translation is successful, the scanner advances past the input that matched.


Following is the declaration for java.util.Scanner.nextLong() method

public long nextLong(int radix)


  • radix -- the radix used to interpret the token as an int value

Return Value

This method returns the long scanned from the input


  • InputMismatchException -- if the next token does not match the Integer regular expression, or is out of range

  • NoSuchElementException -- if input is exhausted

  • IllegalStateException -- if this scanner is closed


The following example shows the usage of java.util.Scanner.nextLong() method.

package com.tutorialspoint;

import java.util.*;

public class ScannerDemo {

   public static void main(String[] args) {

   String s = "Hello World! 3 + 3.0 = 6.0 true ";
   Long l = 13964599874l;
   s = s + l;

   // create a new scanner with the specified String Object
   Scanner scanner = new Scanner(s);

   // find the next long token and print it
   // loop for the whole scanner
   while (scanner.hasNext()) {

   // if no long is found, print "Not Found:" and the token
   System.out.println("Not Found :" +;

   // if the next is a long, print found and the long with radix 20
   if (scanner.hasNextLong()) {
   System.out.println("Found :" + scanner.nextLong(20));


   // close the scanner

Let us compile and run the above program, this will produce the following result:

Not Found :Hello
Not Found :World!
Found :3
Not Found :+
Not Found :3.0
Not Found :=
Not Found :6.0
Not Found :true
Found :12014353515344