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The objects making up a system communicate by sending messages to each other. For example, a system might send a closeAccount() message to a SavingsAccount object of a bank computer system for a particular client’s bank account. An object receiving a valid message will respond by performing some operation(s): i.e. the object will exhibit some behaviour. For example, after receiving the closeAccount() message a SavingsAccount object might send a message to request a cheque be sent to the client for the balance, set its balance to zero and then disable any more transactions to be processed for the account.
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