Java Scanner hasNextBoolean() Method

The hasNextBoolean() 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 boolean value using a case insensitive pattern created from the string "true/false". It returns true if the scanner's input can be interpreted as a boolean value, otherwise returns false.

Syntax

Following is the declaration of hasNextBoolean() method:

Parameter

This method does not accept any parameter.

Returns

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

Exceptions

IllegalStateException

Compatibility Version

Java 1.5 and above

Example 1

import java.util.*;
public class ScannerHasNextBooleanExample1 {  
    public static void main(String args[]){   	
    	  String str1 = "JavaTpoint.com!";  	
        Scanner scanner = new Scanner(str1); 
        System.out.println("Result: "+scanner.hasNextBoolean());
        System.out.println("Scan String: "+scanner.next());         
        scanner.close();
	  }  
}

Output:

Result: false
Scan String: JavaTpoint.com!

Example 2

import java.util.*;
public class ScannerHasNextBooleanExample2 {  
    public static void main(String args[]){   	
    	  String str1 = "false";  	
        Scanner scanner = new Scanner(str1); 
        System.out.println("Result: "+scanner.hasNextBoolean());
        System.out.println("Scan String: "+scanner.next());         
        scanner.close();
	  }  
}

Output:

Result: true
Scan String: false

Example 3

import java.util.*;
public class ScannerHasNextBooleanExample3 {  
    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.hasNextBoolean())
        {
          boolean b = scan.hasNextBoolean();
          System.out.println("Your entered value: " + b);
        }             
        scan.close();
	  }  
}

Output:

Please enter value: true
Your entered value: true

Example 4

import java.util.Scanner;  
public class ScannerHasNextBooleanExample4 {  
     public static void main(String args[]){ 
    	   String s = "Hello JavaTpoint! 13 + 13.0 = 26";
         Scanner scanner = new Scanner(s);
         while (scanner.hasNext()) {           
            //Check if the scanner's next token is a BigDecimal
            System.out.println("" + scanner.hasNextBoolean());
            System.out.println("" + scanner.next());
         }
         scanner.close();
     }  
} 

Output:

false
Hello
false
JavaTpoint!
false
13
false
+
false
13.0
false
=
false
26

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