HANDLING EXCEPTIONS AND EVENTS - Java Programming: From Problem Analysis to Program Design - page 756

Fix the Error and Continue
In other cases, you will want to handle the exception and let the program continue.
Suppose you have a program that takes as input an integer. If a user inputs a character in
place of a digit, the program will throw an InputMismatchException . This is a
situation where you can include the necessary code to keep prompting the user to input
a number until the entry is valid. Example 11-11 illustrates this concept.

EXAMPLE 11-11

The following program continues to prompt the user until the user enters a valid integer.
import java.util.*;

public class FixErrorAndContinue
{

static Scanner console = new Scanner(System.in);

public static void main(String[] args)
{

int number; //Line 1

boolean done; //Line 2

String str; //Line 3

done = false ; //Line 4

do //Line 5

{

try //Line 6

{

System.out.print("Line 7: Enter an "
+ "integer: ");

//Line 7

number = console.nextInt(); //Line 8

System.out.println(); //Line 9

done = true ; //Line 10

System.out.println("Line 11: number = "
+ number); //Line 11

}
catch (InputMismatchException imeRef) //Line 12

{

str = console.next(); //Line 13

System.out.println("Line 14: Exception "
+ imeRef.toString()
+ " " + str);

//Line 14

}

}
while (!done); //Line 15

}

}