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Thread: I am Facing problem in Scanner Class

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    Default I am Facing problem in Scanner Class

    Dear Friends,
    If I enter the wrong input(example , if I enter String instead of Integer) loop is not ending, it wont get input next time. can you please help this?. Thanks in advance!!!

    import java.util.InputMismatchException;
    import java.util.Scanner;
     
    /**
     * If we enter the wrong input(example , if we enter sting instead of integer) it goes unending loop
     * 
     * @author Nithish
     *
     */
    public class Sample2 {
    	public static void main(String[] args) {
    		Scanner scanner = new Scanner(System.in);
    		for (int i = 0; i < 1; i++) {
    			try {
    				System.out.println("Enter the value");
    				int obj = scanner.nextInt();
    				System.out.println(obj);
    			} catch (InputMismatchException e) {
    				i--;
    				e.printStackTrace();
    			}
    		}
    	}
    }
    Last edited by KevinWorkman; October 11th, 2011 at 10:34 AM. Reason: please use highlight tags when posting code!


  2. #2
    Crazy Cat Lady KevinWorkman's Avatar
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    Default Re: I am Facing problem in Scanner Class

    From what I can tell, Scanner does not advance past that element if it throws an InputMismatchException. So you're going to keep bumping into the same value, which is going to throw the same Exception, over and over again.

    Also, it looks like you're looking for a do while loop, not a for loop. What you have might do the trick, but it sure does look funny.
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    Default Re: I am Facing problem in Scanner Class

    The loop doesn't end when you enter the wrong input because of i--;

    The wrong input causes the InputMismatchException to be thrown and the i--;
    is causing an infinate loop.

    Even by removing this, you won't be able to enter another value though as the InputMismatchException is thrown.
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