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