Java.util.Scanner.hasNextDouble() Method

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Description

The java.util.Scanner.hasNextDouble() method returns true if the next token in this scanner's input can be interpreted as a double value using the nextDouble() method. The scanner does not advance past any input.

Declaration

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

public boolean hasNextDouble()

Parameters

  • NA

Return Value

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

Exception

  • IllegalStateException -- if this scanner is closed

Example

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

package com.tutorialspoint;

import java.util.*;

public class ScannerDemo {

   public static void main(String[] args) {

      String s = "Hello World! 3 + 3.0 = 6 ";
      Double d=1.3985;
      s=s+d;

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

      // assign locale as US to recognize double numbers in a string
      scanner.useLocale(Locale.US);
      
      while (scanner.hasNext()) {
         // check if the scanner's next token is a double
         System.out.println("" + scanner.hasNextDouble());

         // 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
+
true
3.0
false
=
true
6
true
1.3985



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