Encapsulation (computer programming): Difference between revisions

Revision as of 11:46, 7 December 2014

Revision as of 16:47, 17 December 2014

Line 61:

<source lang="php">

<?php

class person {

class Account

var $name;

{

public $height;

/**

protected $social_insurance;

* How much money is currently in the account

private $pinn_number;

* @var float

*/

function __construct($persons_name) {

private $accountBalance;

$this->name = $persons_name;

}

function set_name($new_name) {

$this->name = $new_name;

}

/**

function get_name() {

* @param float $currentAccountBalance Initialize account to this dollar amount

return $this->name;

*/

}

public function __construct($currentAccountBalance)

{

}

$this->accountBalance = $currentAccountBalance;

}

/**

* Add money to account

* @param float $money Dollars to add to balance

* @return void

*/

public function add($money)

{

$this->accountBalance += $money;

}

/**

* Remove money from account

* @param float $money Dollars to subtract from balance

* @throws Exception

* @return void

*/

public function withdraw($money)

{

if($this->accountBalance < $money){

throw new Exception('Cannot withdraw $'.$money.' from account as it contains $'.$this->accountBalance);

}

$this->accountBalance -= $money;

}

/**

* Get current account balance, that takes all additions and subtractions into consideration.

*

* @return float

*/

public function getAccountBalance()

{

return $this->nameaccountBalance;

}

}

// Create a new object from the Account class with a starting balance of $500.00

$myAccount = new Account(500.00);

// We have clearly defined methods for adding and subtracting money from the Account

// If we didn't have a method for withdraw(), nothing would prevent us from withdrawing more money than was available in the account

$myAccount->add(10.24);

$myAccount->withdraw(4.45);

// Get the current balance

$accountBalance = $myAccount->getAccountBalance();

echo 'My Account Balance: $' . $accountBalance; // 505.79

// Our code forbids us from withdrawing more than we have

$myAccount->withdraw(600.00); // Exception Message: Cannot withdraw $600 from account as it contains $505.79

</source>