To toggle between navigation mode and editing mode press the F2 keyboard shortcut. ____________________
Answer the following statement true (T) or false (F)
True
You might also like to view...
Visual Basic _______.
a) was intended for expert programmers. b) makes the development of Windows applications easier. c) was derived from BASIC. d) a and b. e) b and c.
A runtime exception is a/an:
a. checked exception b. unchecked exception c. offending exception d. none of the above
Rewrite the class so that it throws appropriate exceptions instead of returning -1 as an error code. Write test code that attempts to withdraw and deposit invalid amounts and catches the exceptions that are thrown.
A method that returns a special error code can sometimes cause problems. The caller might ignore the error code or treat the error code as a valid return value. In this case it is better to throw an exception instead. The following class maintains an account balance and returns a special error code. ``` { private double balance; public Account() { balance = 0; } public Account(double initialDeposit) { balance = initialDeposit; } public double getBalance() { return balance; } // returns new balance or -1 if error public double deposit(double amount) { if (amount > 0) balance += amount; else return -1; // Code indicating error return balance; } // returns new balance or -1 if invalid amount public double withdraw(double amount) { if ((amount > balance) || (amount < 0)) return -1; else balance -= amount; return balance; } } ``` This solution throws a NegativeAmount and InsufficientBalance exception. It is worth pointing out to the students the problems that would occur if negative account balances were desirable.
When text that includes a footnote number is selected, the text in the corresponding footnote is also selected
Indicate whether the statement is true or false