In this tutorial, we’ll be discussing and implementing the Android MVVM Architectural Pattern in our Android Application. We’ve previously discussed the Android MVP Pattern. Why do we need these patterns? Adding everything in a Single Activity or Fragment would lead to problems in testing and refactoring the code. Hence, the use of separation of code […]
MVC Design Pattern
MVC Design Pattern is one of the oldest architectural pattern for web applications. MVC stands for Model View Controller. MVC Design Pattern is used to separate the logic of different layers in a program in independent units. This is known as the principle of Separation of Concern. MVC Design Pattern With MVC design pattern, we […]
DAO Design Pattern
DAO stands for Data Access Object. DAO Design Pattern is used to separate the data persistence logic in a separate layer. This way, the service remains completely in dark about how the low-level operations to access the database is done. This is known as the principle of Separation of Logic. DAO Design Pattern With DAO […]
Factory Design Pattern In Scala
I’m going to deliver a series of Scala Design Patterns in my coming posts. I will pick-up each Java Design Pattern Tutorial explained in JournalDEV and convert it into Scala. We will also discuss about which Language is best: Java Vs Scala to implement them. In this post, we are going to discuss about “Factory […]
Java Dependency Injection – DI Design Pattern Example Tutorial
Java Dependency Injection design pattern allows us to remove the hard-coded dependencies and make our application loosely coupled, extendable and maintainable. We can implement dependency injection in java to move the dependency resolution from compile-time to runtime. Java Dependency Injection Java Dependency injection seems hard to grasp with theory, so I would take a simple […]
Java Design Patterns – Example Tutorial
Design Patterns are very popular among software developers. A design pattern is a well-described solution to a common software problem. I have written extensively on java design patterns. You can download PDF eBook (130+ pages) by subscribing to our newsletter. Java Design Patterns Some of the benefits of using design patterns are: Design Patterns are […]
Visitor Design Pattern in Java
Visitor Design Pattern is one of the behavioral design pattern. Visitor Design Pattern Visitor pattern is used when we have to perform an operation on a group of similar kind of Objects. With the help of visitor pattern, we can move the operational logic from the objects to another class. For example, think of a […]
Template Method Design Pattern in Java
Template Method is a behavioral design pattern. Template Method design pattern is used to create a method stub and deferring some of the steps of implementation to the subclasses. Template Method Design Pattern Template method defines the steps to execute an algorithm and it can provide default implementation that might be common for all or […]
Strategy Design Pattern in Java – Example Tutorial
Strategy design pattern is one of the behavioral design pattern. Strategy pattern is used when we have multiple algorithm for a specific task and client decides the actual implementation to be used at runtime. Strategy Pattern Strategy pattern is also known as Policy Pattern. We define multiple algorithms and let client application pass the algorithm […]
State Design Pattern in Java
State design pattern is one of the behavioral design pattern. State design pattern is used when an Object change its behavior based on its internal state. State Design Pattern If we have to change the behavior of an object based on its state, we can have a state variable in the Object. Then use if-else […]