Java.util.Scanner.nextBoolean() Method

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.

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