Java Scanner hasNextBigInteger() Method

The hasNextBigInteger() is a Java Scanner class method which is used to check the next token in this scanner's input can be interpreted as a BigInteger value in the default radix or not. It returns true if it is interprated as a BigInteger value, otherwise returns false. There is two different types of Java hasNextBigInteger() method which can be differentiated depending on its parameter. These are:

Java Scanner hasNextBigInteger() Method
Java Scanner hasNextBigInteger(int radix) Method

hasNextBigInteger() Method:

This is a Java Scanner class method which is used to check the next token in this scanner's input can be interpreted as a BigInteger value in the default radix using the nextBigInteger() method.

hasNextBigInteger(int radix) Method:

This is an inbuilt method of Java Scanner class which is used to check the next token in this scanner's input can be interpreted as a BigInteger value in the specified radix using the nextBigInteger() method.

Syntax

Following is the declaration of hasNextBigInteger() method:

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

Parameter

DataType	Parameter	Description	Required/Optional
int	radix	It is used to interpret the token as an Integer value.	Required

Returns

The hasNextBigInteger() method returns true if and only if this scanner's next token is a valid Integer value.

Exceptions

IllegalStateException- This method throws exception if the innvocation is done after the scanner has been closed.

IllegalArgumentException- It throws this exception if the specified radix is out of range.

Compatibility Version

Java 1.5 and above

Example 1

import java.util.*;
public class ScannerHasNextBigIntegerExample1 {  
    public static void main(String args[]){  
    	//Initialize the scanner
    	Scanner scan = new Scanner(" 22 Double 75 number is 2123324.58");
    	//Iterate through the tokens
    	while(scan.hasNext()){
    		//Print Integer value
    		if(scan.hasNextBigInteger()){
    			System.out.println("Found Integer Value: "+scan.next());
    		}
    		else{
    			System.out.println("Not Found Integer Value: "+scan.next());
    		}
    	}
    	scan.close();
	}  
}

Output:

Found Integer Value: 22
Not Found Integer Value: Double
Found Integer Value: 75
Not Found Integer Value: number
Not Found Integer Value: is
Not Found Integer Value: 2123324.58

Example 2

import java.util.Scanner;  
public class ScannerHasNextBigIntegerExample2 {  
     public static void main(String args[]){ 
    	   String str = " 11 Java 11 + 11 = 22.0";
         Scanner scanner = new Scanner(str);
         while (scanner.hasNext()) {
         if (scanner.hasNextBigInteger()) {
             System.out.println("Found :" + scanner.nextBigInteger(598670));
         }
         //If BigInteger is not found, print "Not Found" and the token string
         System.out.println("Not Found :" + scanner.next());
         }
         scanner.close();
         }  
} 

Output:

Exception in thread "main" java.lang.IllegalArgumentException: radix:598670
	at java.base/java.util.Scanner.setRadix(Scanner.java:1368)
	at java.base/java.util.Scanner.nextBigInteger(Scanner.java:2673)
	at myPackage.ScannerHasNextBigIntegerExample2.main(ScannerHasNextBigIntegerExample2.java:9)

Example 3

import java.util.Scanner;  
public class ScannerHasNextBigIntegerExample3 {  
     public static void main(String args[]){ 
    	   String str = "JavaTpoint.com 11 + 11 = 22.0";
         Scanner scanner = new Scanner(str);
         while (scanner.hasNext()) {
         //If the next is Integer with radix 6, print found and the byte
         if (scanner.hasNextBigInteger(6)) {
             System.out.println("Found :" + scanner.nextBigInteger());
         }
         //If Integer is not found, print "Not Found" and the token
         System.out.println("Not Found :" + scanner.next());
         }
         scanner.close();
         }  
} 

Output:

Not Found :JavaTpoint.com
Found :11
Not Found :+
Found :11
Not Found :=
Not Found :22.0

Example 4

import java.util.*;
public class ScannerHasNextBigIntegerExample4 {  
    public static void main(String args[]){   	
    	  Scanner scan = new Scanner(System.in);
        System.out.print("Please enter value: ");    
        if(scan.hasNextBigInteger())
        {
          int x = scan.nextInt();
          System.out.println("Your entered value: " + x);
        } 
        else {
        	System.out.println("Please entered the Integer value. ");
        }
        scan.close();
	  }  
}

Output:

Please enter value: 3453740
Your entered value: 3453740

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