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Scanner ioException() method in Java with Examples
  • Last Updated : 16 Oct, 2018

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:






// 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();
    }
}


Output:

gfg geeks!
null

Program 2:




// 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();
    }
}


Output:

gopal dave!
null

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

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