*******************************************************


Three methods that might throw an exception

Class        Method                 Throws
Scanner      nextDouble()           InputMismatchException

Integer      parseInt(String)       NumberFormatException

Double       parseDouble(String)    NumberFormatException





*******************************************************



Two ways to import the InputMismatchException class

import java.util.InputMismatchException;
import.java.util.*;



*******************************************************

double subtotal = 0.0;
try
{
    System.out.print("Enter subtotal: ");
    subtotal = sc.nextDouble();
}
catch(InputMismatchException e)
{
    sc.next();     // discard the incorrectly entered double
    System.out.println("Error! Invalid number. Try again.\n");
    continue;      // jump to the top of the loop

}