Java.util.Scanner.nextInt() Method

Description

The java.util.Scanner.nextInt() method Scans the next token of the input as an int.An invocation of this method of the form nextInt() behaves in exactly the same way as the invocation nextInt(radix), where radix is the default radix of this scanner.

Declaration

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

public int nextInt()

Parameters

• NA

Return Value

This method returns the int scanned from the input

Exception

• InputMismatchException -- if the next token does not match the Integer regular expression, or is out of range

• NoSuchElementException -- if the input is exhausted

• IllegalStateException -- if this scanner is closed

Example

The following example shows the usage of java.util.Scanner.nextInt() method.

package com.tutorialspoint;

import java.util.*;

public class ScannerDemo {

   public static void main(String[] args) {

      String s = "Hello World! 3 + 3.0 = 6.0 true ";

      // create a new scanner with the specified String Object
      Scanner scanner = new Scanner(s);

      // find the next int token and print it
      // loop for the whole scanner
      while (scanner.hasNext()) {

         // if the next is a int, print found and the int
         if (scanner.hasNextInt()) {
            System.out.println("Found :" + scanner.nextInt());
         }
         // if no int is found, print "Not Found:" and the token
         System.out.println("Not Found :" + scanner.next());
      }

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

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

Not Found :Hello
Not Found :World!
Found :3
Not Found :+
Not Found :3.0
Not Found :=
Not Found :6.0
Not Found :true