Java Scanner hasNextFloat() Method

The hasNextFloat() is a method of Java Scanner class which is used to check if the next token in this scanner's input can be interpreted as a float value using the nextFloat() method. It returns true if the scanner's input can be interpreted as a float value, otherwise returns false.

Syntax

Following is the declaration of hasNextFloat() method:

Parameter

This method does not accept any parameter.

Returns

The hasNextFloat() method returns true if and only if this scanner's next token is a valid float value.

Exceptions

IllegalStateException

Compatibility Version

Java 1.5 and above

Example 1

import java.util.*;
public class ScannerHasNextFloatExample1 {  
    public static void main(String args[]){   	
    	  String str1 = "JavaTpoint.com!";  	
        Scanner scanner = new Scanner(str1); 
        System.out.println("Result: "+scanner.hasNextFloat());
        System.out.println("Scan String: "+scanner.next());         
        scanner.close();
	  }  
}

Output:

Result: false
Scan String: JavaTpoint.com!

Example 2

import java.util.*;
public class ScannerHasNextFloatExample2 {  
    public static void main(String args[]){   	
    	  String s = "Hello World! 12 + 13.0 = 15.00 ";
        Float f = 2.123f;
        s = s + f;
        //Create a new scanner 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 scanned input
           System.out.println("Scan String: " + scanner.next());
           }    
        scanner.close();
	  }  
}

Output:

Scan String: Hello
 false
Scan String: World!
 true
Scan String: 12
 false
Scan String: +
 true
Scan String: 13.0
 false
Scan String: =
 true
Scan String: 15.00
 true
Scan String: 2.123

Example 3

import java.util.*;
public class ScannerHasNextFloatExample3 {  
    public static void main(String args[]){   	
    	  Scanner scan = new Scanner(System.in);
        System.out.print("Please enter value: ");    
        if(scan.hasNextInt())
        {
          int x = scan.nextInt();
          System.out.println("Your entered value: " + x);
        }
        else if(scan.hasNextFloat())
        {
          boolean b = scan.hasNextFloat();
          System.out.println("Your entered value: " + b);
        }             
        scan.close();
	  }  
}

Output:

Please enter value: 454.787
Your entered value: true

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