What is the difference between the Proxy Pattern and the Adapter Pattern?

What is the difference between the Proxy Pattern and the Adapter Pattern?

The Proxy Pattern provides a surrogate or placeholder for another object to control access to it, while the Adapter Pattern allows incompatible interfaces to work together by converting the interface of one class into another that a client expects.

Can you give me an example of each pattern?

Sure! For the Proxy Pattern, think of a virtual proxy that loads images on demand. For the Adapter Pattern, consider a scenario where you have a legacy system that needs to work with a new API; the adapter would convert calls from the legacy system to the new API format.

When should I use one pattern over the other?

Use the Proxy Pattern when you need to control access to an object, like lazy loading or access control. Use the Adapter Pattern when you need to integrate two incompatible interfaces.

Are there any real-world applications of these patterns?

Yes! Proxies are often used in network applications for security and performance, while adapters are commonly used in software libraries to allow different systems to communicate.