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Dependency is just another object that a class needs to do its function.
For example, Main program calls a Service class lets say “Customer Class” to update a customer profile. The Customer class generate the required data and creates an instance of Database operations layer (Let’s say “CustomerOperations class”) to update the database tables. In this example, Customer class is dependent on CustomerOperations class to update a customer profile or CustomerOperations class is the dependency of Customer Class.

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