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create website create website .. and so on public :method1, :method4 protected :method2 private :method3 end A class's initialize method is automatically declared to be private. It's time for some examples. Perhaps we're modeling an accounting system where every debit has a corresponding credit.

create website 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.balance += amount end public #..

create website . def transferToSavings(amount) debit(@checking, amount) credit(@savings, amount) end #... end Protected access is used when objects need to access the internal state of other objects of the same class.

create website 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.Variables Now that we've gone to the trouble to create all these objects, let's make sure we don't lose them. Variables are used to keep track of objects; each variable holds a reference to an object.

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