Implementing Classes - Java Concepts - page 170

and

BankAccount b = new BankAccount(5000);

΢ Exercise R3.4 What happens in our implementation of the BankAccount
class when more money is withdrawn from the account than the current
balance?

΢ Exercise R3.5 What is the value of b.getBalance() after the
following operations?

BankAccount b = new BankAccount(10);
b.deposit(5000);
b.withdraw(b.getBalance() / 2);

΢΢Exercise R3.6 If b1 and b2 refer to objects of class BankAccount ,
consider the following instructions.

b1.deposit(b2.getBalance());
b2.deposit(b1.getBalance());

Are the balances of b1 and b2 now identical? Explain.

΢΢Exercise R3.7 What is the this reference? Why would you use it?

΢΢Exercise R3.8 What does the following method do? Give an example of
how you can call the method.

public class BankAccount
{
public void mystery(BankAccount that,
double amount)
{
this.balance = this.balance - amount;
that.balance = that.balance + amount;
}
. . . // Other bank account methods
}

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΢΢Exercise R3.9 Suppose you want to implement a class
SavingsAccount . A savings account has deposit , withdraw , and
getBalance methods like a bank account, but it has a fixed interest rate
that should be set in the constructor, together with the initial balance. An