What are some common Java design patterns I should know for interviews?

What are some common Java design patterns I should know for interviews?

Some common Java design patterns include Singleton, Factory, Observer, and Strategy patterns. Would you like to know more about any specific one?

Can you explain the Singleton pattern?

The Singleton pattern ensures that a class has only one instance and provides a global point of access to it. It's often used for managing shared resources.

What about the Factory pattern?

The Factory pattern defines an interface for creating objects but allows subclasses to alter the type of objects that will be created. It's useful for managing and encapsulating object creation.

How do I implement the Observer pattern in Java?

To implement the Observer pattern, you create a subject class that maintains a list of observers and notifies them of state changes. Observers implement an interface to receive updates.