Java Scanner hasNextBigInteger() Method

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Description

The Java Scanner hasNextBigInteger() method returns true if the next token in this scanner's input can be interpreted as a BigInteger in the default radix using the nextBigInteger() method. The scanner does not advance past any input.

Declaration

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

public boolean hasNextBigInteger()

Parameters

NA

Return Value

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

Exception

IllegalStateException − if this scanner is closed

Java Scanner hasNextBigInteger(int radix)

Description

The Java Scanner hasNextBigInteger(int radix) method returns true if the next token in this scanner's input can be interpreted as a BigInteger in the specified radix using the nextBigInteger() method. The scanner does not advance past any input.

Declaration

Following is the declaration for Java Scanner hasNextBigInteger() method

public boolean hasNextBigInteger(int radix)

Parameters

radix − the radix used to interpret the token as an integer

Return Value

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

Exception

IllegalStateException − if this scanner is closed

Checking Next Token as BigInteger Using Scanner On a String Example

The following example shows the usage of Java Scanner hasNextBigInteger() method to check if next token is a BigInteger using a default radix. We've created a scanner object using a given string. Then we checked each token to be BigInteger and printed. 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
         System.out.println("" + scanner.hasNextBigInteger());

         // print what is scanned
         System.out.println("" + scanner.next());
      }

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

Output

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

false
Hello
false
World!
true
3
false
+
false
3.0
false
=
true
6

Checking Next Token as BigInteger of Radix 5 Using Scanner On a String Example

The following example shows the usage of Java Scanner hasNextBigInteger() method to check if next token is a BigInteger using a radix of 5. We've created a scanner object using a given string. Then we checked each token to be BigInteger and printed. 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
         System.out.println("" + scanner.hasNextBigInteger(4));

         // print what is scanned
         System.out.println("" + scanner.next());
      }

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

Output

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

false
Hello
false
World!
true
3
false
+
false
3.0
false
=
false
6

Checking Next Token as BigInteger Using Scanner On User Input Example

The following example shows the usage of Java Scanner hasNextBigInteger() method to check if next token is a BigInteger. We've created a scanner object using System.in class. Then we checked each token to be BigInteger and printed. 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()){
         // print what is scanned
         System.out.println(scanner.next());		 
      } else {
         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 3.0.)

3
3