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:Â
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:Â
Java
// Java program to illustrate the// hasNextBigInteger() method of Scanner class in Java// with parameterÂ
import java.util.*;Â
public class GFG1 {    public static void main(String[] argv)        throws Exception    {Â
        String s = "gfg 2 geeks!";Â
        // new scanner with the        // specified String Object        Scanner scanner = new Scanner(s);Â
        // use US locale to interpret BigIntegers in a string        scanner.useLocale(Locale.US);Â
        // iterate till end        while (scanner.hasNext()) {Â
            // check if the scanner's            // next token is a BigInteger with a radix 3            System.out.print("" + scanner.hasNextBigInteger(3));Â
            // print what is scanned            System.out.print(" -> " + scanner.next() + "\n");        }Â
        // close the scanner        scanner.close();    }} |
Output:
false -> gfg true -> 2 false -> geeks!
Program 2:Â
Java
// Java program to illustrate the// hasNextBigInteger() method of Scanner class in Java// without parameterÂ
import java.util.*;Â
public class GFG1 {    public static void main(String[] argv)        throws Exception    {Â
        String s = "gfg 2 geeks!";Â
        // new scanner with the        // specified String Object        Scanner scanner = new Scanner(s);Â
        // use US locale to interpret BigIntegers in a string        scanner.useLocale(Locale.US);Â
        // iterate till end        while (scanner.hasNext()) {Â
            // check if the scanner's            // next token is a BigInteger with the default radix            System.out.print("" + scanner.hasNextBigInteger());Â
            // print what is scanned            System.out.print(" -> " + scanner.next() + "\n");        }Â
        // close the scanner        scanner.close();    }} |
Output:
false -> gfg true -> 2 false -> geeks!
Program 3: Program to demonstrate exceptionÂ
Java
// Java program to illustrate the// hasNextBigInteger() method of Scanner class in Java// Exception caseÂ
import java.util.*;Â
public class GFG1 {    public static void main(String[] argv)        throws Exception    {Â
        try {            String s = "gfg 2 geeks!";Â
            // new scanner with the            // specified String Object            Scanner scanner = new Scanner(s);Â
            // use US locale to interpret BigIntegers in a string            scanner.useLocale(Locale.US);Â
            scanner.close();Â
            // iterate till end            while (scanner.hasNext()) {Â
                // check if the scanner's                // next token is a BigInteger with the default radix                System.out.print("" + scanner.hasNextBigInteger());Â
                // print what is scanned                System.out.print(" -> " + scanner.next() + "\n");            }Â
            // 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()
