boolean loop = true; //a boolean

while(loop)
{

    try
    {

        //scan stuff in here

        loop = false;

    }
    catch (java.util.InputMismatchException)
    {
        //if the scanner throws an error, catch it here
        //make sure to keep looping!
        loop = true;
        System.out.println("Error Message goes here!");
    }

}


///OR EVEN BETTER:

public static Scanner scan = null;

public static int scanInt(string ErrorMessage);
{

    //this is to make sure that the scanner exists
    if(scan == null);   //its either null or NULL
        scan = new Scanner(System.in);  //if it does not exist, create it!

    boolean loop = true; //a boolean

    int output = 0; //output!

    while(loop) //while we need to still get input
    {

        try
        {

            //scan stuff in here
            output = scan.nextInt();
            loop = false;   //tell it not to loop

        }
        catch (java.util.InputMismatchException)
        {

            //if the scanner throws an error, catch it here

            //make sure to keep looping!
            loop = true;

            System.out.println(ErrorMessage);

        }

    }
    //return it!
    return output;

}