Java Reference
In-Depth Information
Display 9.11 An Exception Controlled Loop
1
import java.util.Scanner;
2
import java.util.InputMismatchException;
3 public class InputMismatchExceptionDemo
4{
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public static void main(String[] args)
6
{
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Scanner keyboard = new Scanner(System.in);
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int number = 0; //to keep compiler happy
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boolean done = false ;
If nextInt throws an exception, the
try block ends and so the boolean
variable done is not set to true .
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while (! done)
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{
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try
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{
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System.out.println("Enter a whole number:");
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number = keyboard.nextInt();
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done = true ;
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}
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catch (InputMismatchException e)
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{
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keyboard.nextLine();
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System.out.println("Not a correctly written whole number.");
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System.out.println("Try again.");
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}
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}
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System.out.println("You entered " + number);
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}
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}
Sample Dialogue
Enter a whole number:
forty two
Not a correctly written whole number.
Try again.
Enter a whole number:
fortytwo
Not a correctly written whole number.
Try again.
Enter a whole number:
42
You entered 42
 
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