Scanner hasNextBigInteger() method in Java with Examples

Last Updated : 17 Nov, 2022

The hasNextBigInteger() method of java.util.Scanner class returns true if the next token in this scanner’s input can be assumed as a BigInteger value of the given radix. The scanner does not advance past any input. In case no radix is passed as a parameter, the function interprets the radix to be default radix and functions accordingly. Syntax:

public boolean hasNextBigInteger(int radix)
            or
public boolean hasNextBigInteger()

Parameters: The function accepts a single parameter radix which is not a mandatory one. It specifies the radix used to interpret the token as a BigInteger value. Return Value: This function returns true if and only if this scanner’s next token is a valid BigInteger value in the default radix. Exceptions: The function throws IllegalStateException if this scanner is closed. Below programs illustrate the above function: Program 1:

Java

// Java program to illustrate the
// hasNextBigInteger() method of Scanner class in Java
// with parameter
 
import java.util.*;
 
public class GFG1 {
    public static void main(String[] argv)
        throws Exception
    {
 
        String s = "gfg 2 geeks!";
 
        // new scanner with the
        // specified String Object
        Scanner scanner = new Scanner(s);
 
        // use US locale to interpret BigIntegers in a string
        scanner.useLocale(Locale.US);
 
        // iterate till end
        while (scanner.hasNext()) {
 
            // check if the scanner's
            // next token is a BigInteger with a radix 3
            System.out.print("" + scanner.hasNextBigInteger(3));
 
            // print what is scanned
            System.out.print(" -> " + scanner.next() + "\n");
        }
 
        // close the scanner
        scanner.close();
    }
}

Output:

false -> gfg
true -> 2
false -> geeks!

Program 2:

Java

// Java program to illustrate the
// hasNextBigInteger() method of Scanner class in Java
// without parameter
 
import java.util.*;
 
public class GFG1 {
    public static void main(String[] argv)
        throws Exception
    {
 
        String s = "gfg 2 geeks!";
 
        // new scanner with the
        // specified String Object
        Scanner scanner = new Scanner(s);
 
        // use US locale to interpret BigIntegers in a string
        scanner.useLocale(Locale.US);
 
        // iterate till end
        while (scanner.hasNext()) {
 
            // check if the scanner's
            // next token is a BigInteger with the default radix
            System.out.print("" + scanner.hasNextBigInteger());
 
            // print what is scanned
            System.out.print(" -> " + scanner.next() + "\n");
        }
 
        // close the scanner
        scanner.close();
    }
}

Output:

false -> gfg
true -> 2
false -> geeks!

Program 3: Program to demonstrate exception

Java

// Java program to illustrate the
// hasNextBigInteger() method of Scanner class in Java
// Exception case
 
import java.util.*;
 
public class GFG1 {
    public static void main(String[] argv)
        throws Exception
    {
 
        try {
            String s = "gfg 2 geeks!";
 
            // new scanner with the
            // specified String Object
            Scanner scanner = new Scanner(s);
 
            // use US locale to interpret BigIntegers in a string
            scanner.useLocale(Locale.US);
 
            scanner.close();
 
            // iterate till end
            while (scanner.hasNext()) {
 
                // check if the scanner's
                // next token is a BigInteger with the default radix
                System.out.print("" + scanner.hasNextBigInteger());
 
                // print what is scanned
                System.out.print(" -> " + scanner.next() + "\n");
            }
 
            // close the scanner
            scanner.close();
        }
        catch (IllegalStateException e) {
            System.out.println("Exception: " + e);
        }
    }
}

Output:

Exception: java.lang.IllegalStateException: Scanner closed

Reference: https://docs.oracle.com/javase/7/docs/api/java/util/Scanner.html#hasNextBigInteger()

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