Java Scanner nextBigInteger() Method

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Description

The Java Scanner nextBigInteger() method scans the next token of the input as a BigInteger.An invocation of this method of the form nextBigInteger() behaves in exactly the same way as the invocation nextBigInteger(radix), where radix is the default radix of this scanner.

Declaration

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

public BigInteger nextBigInteger()

Parameters

NA

Return Value

This method returns the BigInteger scanned from the input

Exception

• InputMismatchException − if the next token does not match the Integer regular expression, or is out of range

• NoSuchElementException − if the input is exhausted

• IllegalStateException − if this scanner is closed

Java Scanner nextBigInteger(int radix) Method

Description

The java.util.Scanner.nextBigInteger(int radix) method scans the next token of the input as a BigInteger. If the next token matches the Integer regular expression defined above then the token is converted into a BigInteger value as if by removing all group separators, mapping non-ASCII digits into ASCII digits via the Character.digit, and passing the resulting string to the BigInteger(String, int) constructor with the specified radix.

Declaration

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

public BigInteger nextBigInteger(int radix)

Parameters

radix − the radix used to interpret the token

Return Value

This method returns the BigInteger scanned from the input

Exception

• InputMismatchException − if the next token does not match the Integer regular expression, or is out of range

• NoSuchElementException − if the input is exhausted

• IllegalStateException − if this scanner is closed

Getting Next Token as BigInteger of a Scanner on a String Example

The following example shows the usage of Java Scanner nextBigInteger() method to scan the next token as BigInteger with default radix. We've created a scanner object using a given string. Then we checked each token to be BigInteger and printed otherwise Not Found is printed along with scanned token. In the end scanner is closed using close() method.

package com.tutorialspoint;

import java.util.Scanner;

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

      String s = "Hello World! 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 BigInteger
         if(scanner.hasNextBigInteger()){
            // print what is scanned
            System.out.println("Found: " + scanner.nextBigInteger());		 
         } else {
            System.out.println("Not Found: " + scanner.next());
         }
      }

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

Output

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

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

Getting Next Token as BigInteger with Radix of a Scanner on a String Example

The following example shows the usage of Java Scanner nextBigInteger() method to scan the next token as BigInteger with given radix. We've created a scanner object using a given string. Then we checked each token to be BigInteger and printed otherwise Not Found is printed along with scanned token. In the end scanner is closed using close() method.

package com.tutorialspoint;

import java.util.Scanner;

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

      String s = "Hello World! 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 BigInteger
         if(scanner.hasNextBigInteger(4)){
            // print what is scanned
            System.out.println("Found: " + scanner.nextBigInteger(4));		 
         } else {
            System.out.println("Not Found: " + scanner.next());
         }
      }

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

Output

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

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

Getting Next Token as BigInteger of a Scanner on User Input Example

The following example shows the usage of Java Scanner nextBigInteger() method to scan the next token as BigInteger with given radix. We've created a scanner object using System.in class. Then we checked each token to be BigInteger and printed otherwise Not Found is printed along with scanned token. In the end scanner is closed using close() method.

package com.tutorialspoint;

import java.util.Scanner;

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

      // create a new scanner with System Input
      Scanner scanner = new Scanner(System.in);
         
      // check if the scanner's next token is a BigInteger
      if(scanner.hasNextBigInteger(4)){
         // print what is scanned
         System.out.println("Found: " + scanner.nextBigInteger(4));		 
      } else {
         System.out.println("Not Found: " + scanner.next());
      }

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

Output

Let us compile and run the above program, this will produce the following result − (where we've entered 3)

3
Found: 3