Java.util.Scanner.hasNextFloat() Method

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Description

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

Declaration

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

public boolean hasNextFloat()

Parameters

NA

Return Value

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

Exception

IllegalStateException − if this scanner is closed

Example

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

package com.tutorialspoint;

import java.util.*;

public class ScannerDemo {
   public static void main(String[] args) {

      String s = "Hello World! 3 + 3.0 = 6 ";
      Float f = 3.12345f;
      s = s + f;

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

      // assign locale as US to recognize float numbers in a string
      scanner.useLocale(Locale.US);

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

         // 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
3.12345