Scanner ioException() method in Java with Examples

The ioException() method of java.util.Scanner class returns the IOException last thrown by this Scanner’s underlying Readable. This method returns null if no such exception exists.

Syntax:

public IOException ioException()

Return Value: This function returns the last exception thrown by this scanner’s readable.

Below programs illustrate the above function:

Program 1:

filter_none

edit
close

play_arrow

link
brightness_4
code

// Java program to illustrate the
// ioException() 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 geeks!";
  
        // create a new scanner
// with the specified String Object
        Scanner scanner = new Scanner(s);
  
        // print the line
        System.out.println("" + scanner.nextLine());
  
        // check if there is an IO exception
        System.out.println("" + scanner.ioException());
  
        // close the scanner
        scanner.close();
    }
}

chevron_right


Output:

gfg geeks!
null

Program 2:

filter_none

edit
close

play_arrow

link
brightness_4
code

// Java program to illustrate the
// ioException() method of Scanner class in Java
// without parameter
  
import java.util.*;
  
public class GFG1 {
    public static void main(String[] argv)
        throws Exception
    {
  
        String s = "gopal dave!";
  
        // new scanner with the specified String Object
        Scanner scanner = new Scanner(s);
  
        // print the line
        System.out.println("" + scanner.nextLine());
  
        // checks if there is an IO exception
        System.out.println("" + scanner.ioException());
  
        // close the scanner
        scanner.close();
    }
}

chevron_right


Output:

gopal dave!
null

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



My Personal Notes arrow_drop_up

The function of education is to teach one to think intensively and to think critically

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.