The Proxy pattern allows us to create an intermediary that acts as an interface to another resource, while also hiding the underlying complexity of the component.
I have created an SystemAccess.java interface and concrete classes implementing the interface. ProxyAccess.java is a a proxy class to limit access to the system for employees having certain level of designation in the company.
Using this Proxy Access we have achieved limiting access to the important functionality of the system. It could be anything in the real world which involves security concer such as revealling too much information regarding ATM transactions, SSN details, Access to systems, Admin level permissions for databases etc.
FactoryMain.java class contains the main methos which in turn creates object of the factory classGlobeFactory.java and actually demands which object needs to be created.
As you can see in the output there is a limitation on the access just ny knowing the designation of the employee by its name by getRole method. grantInternetAccess gives access to the employees of certain designation from the proxy class.
$output:
No Internet access granted. Your job level is below 5
Internet Access granted for employee: John With destignation level of 10