Java Scanner ioException() Method

The ioException() is a method of Java Scanner class which is used to get the IOException last thrown by this Scanner's readable. It returns null if no such exception exists..

Syntax

Following is the declaration of ioException() method:

Parameter

This method does not accept any parameter.

Returns

The ioException() method returns the last exception thrown by this scanner's readable.

Exceptions

Compatibility Version

Java 1.5 and above

Example 1

import java.util.*;
public class ScannerIOExceptionExample1 {  
	public static void main(String[] args) {
		//Create a new scanner with the specified String Object
	      Scanner scan = new Scanner("Hello World! Hello JavaTpoint.");
	      //Print the line
	      System.out.println("" + scan.nextLine());
	      //Check if there is an IO exception
	      System.out.println("Exception Output: " + scan.ioException());
	      scan.close();	
	}
}

Output:

Hello World! Hello JavaTpoint.
Exception Output: null

Example 2

import java.util.*;
import java.util.regex.Pattern;
public class ScannerIOExceptionExample2 {  
    public static void main(String args[]){   	
    	      //Create Scanner object
    		Scanner scan = new Scanner("Names:Raju1;Pawan;Suresh");
    		//Declare the delimiter
    		scan.useDelimiter(";");
    		/*Initialize the String pattern which signifies that the String
    		token contains characters of the alphabet only*/
    		Pattern pattern = Pattern.compile("[A-Za-z]*");
    		while(scan.hasNext()){
    			if(scan.hasNext(pattern)){
    				System.out.println(scan.nextLine());
    				//Check if there is an IO exception
    			      System.out.println("Exception Output: " + scan.ioException());
    			}
    			else
    				scan.next();
    			}
    			scan.close();
		}  
}

Output: