Java.util.Scanner.hasNextLong() Method

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Description

The java.util.Scanner.hasNextLong() method returns true if the next token in this 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.

Declaration

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

public boolean hasNextLong()

Parameters

  • NA

Return Value

This method returns true if and only if this scanner's next token is a valid long value

Exception

  • IllegalStateException -- if this scanner is closed

Example

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

package com.tutorialspoint;

import java.util.*;

public class ScannerDemo {

   public static void main(String[] args) {

      String s = "Hello World! 3 + 3.0 = 6 ";
      Long l=19864876349786l;
      s=s+l;

      // create a new scanner with the specified String Object
      Scanner scanner = new Scanner(s);
      
      // use US locale in order to be able to identify long in a string
      scanner.useLocale(Locale.US);

      while (scanner.hasNext()) {
         // check if the scanner's next token is along
         System.out.println("" + scanner.hasNextLong());

         // print what is scanned
         System.out.println("" + scanner.next());
      }

      // close the scanner
      scanner.close();
   }
}

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

false
Hello
false
World!
true
3
false
+
false
3.0
false
=
true
6
true
19864876349786



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