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()