Information on various patterns for log in/join and in which context to use them? [closed]

1. What are some common design patterns that you see in the android framework?
2. Which design pattern uses shared objects that can be used in multiple contexts simultaneously?
3. How many types of design patterns are there in Java?

What are some common design patterns that you see in the android framework?

So in this blog, we learned about some of the Design Patterns that are used in Android to write a cleaner and understandable code. We learn about Builder pattern, Singleton pattern, Dependency Injection pattern, Adapter pattern, Facade pattern, Observer pattern, Command pattern, MVC, MVP, and MVVM pattern.

Which design pattern uses shared objects that can be used in multiple contexts simultaneously?

The Flyweight pattern describes how to share objects to allow their use at fine granularities without prohibitive cost. A flyweight is a shared object that can be used in multiple contexts simultaneously.

How many types of design patterns are there in Java?

Java design patterns are divided into three categories - creational, structural, and behavioral design patterns.