What is the Observer pattern in C++ and Java?

Can you explain the Observer pattern in C++ and Java?

Sure! The Observer pattern is a behavioral design pattern that allows an object, known as the subject, to maintain a list of its dependents, called observers, and notify them of any state changes.

How is it implemented in C++?

In C++, you typically use classes to define the Subject and Observer. The Subject class maintains a list of observers and provides methods to attach, detach, and notify them.

And how does it differ in Java?

In Java, the Observer pattern is often implemented using interfaces. The Observable class can be extended, and observers can implement the Observer interface to receive updates.

Can you give me a code example for both languages?

Certainly! In C++, you might have a Subject class with a vector of observers, while in Java, you can use the Observable class and override its notifyObservers method.