Proxy design pattern can be used in a wide variety of scenario in

Java. Some of these are as follows:

1. Virtual Proxy: This is a virtual object that acts as a proxy

for objects that are very expensive to create. It is used in

Lazy Loading. When client makes the first request, the real

object is created.

2. Remote Proxy: This is a local object that provides access

to a remote object. It is generally used in Remote Method

Invocation (RMI) and Remote Procedure Call (RPC). It is

also known as a Stub.

3. Protective Proxy: This is an object that control the access

to a Master object. It can authenticate and authorize the

client for accessing the Master object. If client has right

permissions, it allows client to access the main object.

4. Smart Proxy: It is an object that can add additional

information to the main object. It can track the number of

other objects accessing the main object. It can track the

different clients from where request is coming. It can even

deny access to an object if the number of requests is

greater than a threshold.

https://www.geeksforgeeks.org/proxy-design-pattern/