Java.util.Scanner.hasNextBoolean() Method


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Description

The java.util.Scanner.hasNextBoolean() method returns true 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". The scanner does not advance past the input that matched.

Declaration

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

public boolean hasNextBoolean()

Parameters

  • NA

Return Value

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

Exception

  • IllegalStateException -- if this scanner is closed

Example

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

package com.tutorialspoint;

import java.util.*;

public class ScannerDemo {

   public static void main(String[] args) {

   String s = "Hello World! false 3 + 3.0 = 6";

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

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

   // 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
false
false
3
false
+
false
3.0
false
=
false
6

java_util_scanner.htm

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