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affordable web hosting sql server It's time for some examples. Perhaps we're modeling an accounting system where every debit has a corresponding credit. Because we want to ensure that no one can break this rule, we'll make the methods that do the debits and credits private, and we'll define our external interface in terms of transactions. class Accounts private def debit(account, amount) account.balance -= amount end def credit(account, amount) account.
affordable web hosting sql server balance += amount end public #... def transferToSavings(amount) debit(@checking, amount) credit(@savings, amount) end #..
affordable web hosting sql server . end Protected access is used when objects need to access the internal state of other objects of the same class. For example, we may want to allow the individual Account objects to compare their raw balances, but may want to hide those balances from the rest of the world (perhaps because we present them in a different form). class Account attr_reader :balance # accessor method 'balance' protected :balance # and make it protected def greaterBalanceThan(other) return @balance > other.balance end end Because the attribute balance is protected, it's available only within Account objects.
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