Java Scanner nextInt() Method

The nextInt() method of Java Scanner class is used to scan the next token of the input as an int. There is two different types of Java nextInt() method which can be differentiated depending on its parameter. These are:

Java Scanner nextInt() Method
Java Scanner nextInt(int radix) Method

nextInt() Method

This Java Scanner class method is used to scan the next token of the input as an int.

nextInt(int radix) Method

This is an inbuilt method of Java Scanner class which is used to scan the next token of the input as an int in the specified radix.

Syntax

Following is the declaration of nextInt() method:

public boolean nextInt()
public boolean nextInt(int radix)

Parameter

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

Returns

The nextInt() method returns the int value scanned from the input.

Exceptions

InputMismatchException- This method throws exception if the next token does not match the Integer regular expression, or is out of range

IllegalStateException- It throws this 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 ScannerNextIntExample1 {  
	public static void main(String[] args) {
		String str = "Facebook.com 13 + 3.0 = 16 true";
	      Scanner scanner = new Scanner(str);	      	      
	      while (scanner.hasNext()) {
	    	//If the next is a int, print found and the int
	          if (scanner.hasNextInt()) {
	             System.out.println("Found Int Value: "+scanner.nextInt());
	          }
	          //If no int is found, print "Not Found:" and the token
	          System.out.println("Not Found Int value: "+scanner.next());
	      }
	      scanner.close();
	}
}

Output:

Not Found Int value: Facebook.com
Found Int Value: 13
Not Found Int value: +
Not Found Int value: 3.0
Not Found Int value: =
Found Int Value: 16
Not Found Int value: true

Example 2

import java.util.*;
public class ScannerNextIntExample2 {  
    public static void main(String args[]){   	
    	int amount;
    	int balance;
    	//Insert amount and balance from console
    	Scanner input = new Scanner (System.in);
    	System.out.print("Enter the amount: ");
    	amount = input.nextInt();
    	System.out.print("Enter the Total Balance: ");
    	balance = input.nextInt();
    	//Reduce amount+fee from balance
    	balance = balance-(amount + 500);
    	//Print new balance
    	System.out.print("New Balance is: "+balance);
      input.close();
	}  
}

Output:

Enter the amount: 800
Enter the Total Balance: 1500
New Balance is: 200

Example 3

import java.util.*;
public class ScannerNextIntExample3 {  
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);		 
	    System.out.print("Number: ");
	    int number = scan.nextInt();	 
	    System.out.print("String: ");
	    String str = scan.next();	 
	    System.out.println("Output: "+number + ", " + str);
	    scan.close();
	}
}

Output:

Number: 12345
String: JavaTpoint
Output: 12345, JavaTpoint

Example 4

import java.util.*;
public class ScannerNextIntExample4 {  
	public static void main(String[] args) {
		//Initialize the scanner
		Scanner scan = new Scanner("55 B3 -25 -7 1D");
		while(scan.hasNext()){
			//Printing int tokens of base 16
			System.out.println(scan.nextInt(16));
		}
		scan.close();
	}
}

Output:

Example 5

import java.util.*;
public class ScannerNextIntExample5 {  
	public static void main(String[] args) {
		String str = " 11 Java 11 + 11 = 22.0";
            Scanner scanner = new Scanner(str);
            while (scanner.hasNext()) {
            	//If the next is int, print found and the int with radix
                  if (scanner.hasNextInt()) {
                  System.out.println("Found :" + scanner.nextLong(598670));
            }
            //If int is not found, print "Not Found" and the token
            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.nextLong(Scanner.java:2370)
	at myPackage.ScannerNextIntExample5.main(ScannerNextIntExample5.java:10)

Next TopicJava Scanner Class

← prev next →

Help Others, Please Share

Javatpoint Services

JavaTpoint offers too many high quality services. Mail us on [email protected], to get more information about given services.

Website Designing
Website Development
Java Development
PHP Development
WordPress
Graphic Designing
Logo
Digital Marketing
On Page and Off Page SEO
PPC
Content Development
Corporate Training
Classroom and Online Training
Data Entry

Training For College Campus

JavaTpoint offers college campus training on Core Java, Advance Java, .Net, Android, Hadoop, PHP, Web Technology and Python. Please mail your requirement at [email protected].
Duration: 1 week to 2 week

^{Like/Subscribe us for latest updates or newsletter}