$//$ Fig. $3\mathrm{.}8$: Account.java

$//$ Account class with a double instance variable balance and a constructor

$\frac{\frac{?}{?}}{?}$ and deposit method that perform validation.

public class Account $\{$

private String name; $//$ instance variable

private double balance; $//$ instance variable

$//$ Account constructor that receives two parameters

public Account$($String name, double balance$)\{$

this.name $=$ name; $//$ assign name to instance variable name

$//$ validate that the balance is greater than $0\mathrm{.}0$ ; if it's not,

$//$ instance variable balance keeps its default initial value of $.$

if $($balance $>0\mathrm{.}0\{//$ if the balance is valid

$\}$ this.balance $=$ balance; $//$ assign it to instance variable balance

$\}$

$//$ method that deposits $($adds$)$ only a valid amount to the balance public void deposit $($double depositAmount$)\{$

if $($depositAmount $>0\mathrm{.}0//$ if the depositAmount is valid balance $=$ balance $+$ depositAmount; $//$ add it to the balance

$\}$

$//$ method returns the account balance

public double getBalance$()\{$

$\}$ return balance;

$//$ method that sets the name

public void setName$($String name$)\{$

$\}$ this. name $=$ name;

$//$ method that returns the name public String getName$()\{$

$\}$ return name;

$\}$