Java.util.Scanner.nextBoolean() Method


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Description

The java.util.Scanner.nextBoolean() method scans the next token of the input into a boolean value and returns that value. This method will throw InputMismatchException if the next token cannot be translated into a valid boolean value. If the match is successful, the scanner advances past the input that matched.

Declaration

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

public boolean nextBoolean()

Parameters

NA

Return Value

This method returns the boolean scanned from the input

Exception

  • InputMismatchException − if the next token is not a valid boolean

  • NoSuchElementException − if the input is exhausted

  • IllegalStateException − if this scanner is closed

Example

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

Live Demo
package com.tutorialspoint;

import java.util.*;

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

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

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

      // find the next boolean token and print it
      // loop for the whole scanner
      while (scanner.hasNext()) {

         // if the next is boolean, print found and the boolean
         if (scanner.hasNextBoolean()) {
            System.out.println("Found :" + scanner.nextBoolean());
         }

         // if a boolean is not found, print "Not Found" and the token
         System.out.println("Not Found :" + scanner.next());
      }

      // close the scanner
      scanner.close();
   }
}

Let us compile and run the above program, this will produce the following result −

Not Found :Hello
Found :true
Not Found :World!
Not Found :3
Not Found :+
Not Found :3.0
Not Found :=
Not Found :6

java_util_scanner.htm

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