Builder Design Pattern – Implementation in Java

January 24, 2022 ~ Anjana Shankar

I have discussed Singleton Pattern, Observer Pattern, Factory Pattern, Decorator Pattern, and Command Pattern in my previous posts. In this one I will be talking about the Builder Design Pattern. What is the Builder Design Pattern? Builder pattern helps us in creating an immutable class with a large set of state attributes. One of the popular methods of … Continue reading Builder Design Pattern – Implementation in Java

Command Design Pattern – Implementation in Java

August 1, 2021August 3, 2021 ~ Anjana Shankar ~ 1 Comment

I have discussed Singleton Pattern, Observer Pattern, Factory Pattern and Decorator Pattern in my previous posts. In this one I will be talking about Command Design Pattern. What is a Command Pattern? Command Design Pattern is a pattern in which an object is used to represent and encapsulate all the information needed to call a method at a later … Continue reading Command Design Pattern – Implementation in Java

Decorator Design Pattern – Implementation in Java

February 16, 2021August 1, 2021 ~ Anjana Shankar ~ 2 Comments

I have discussed Singleton Pattern, Observer Pattern and Factory Pattern in my previous posts. In this one I will be talking about Decorator Design Pattern. What is a Decorator Pattern? The dictionary definition of the verb decorate is make (something) look more attractive by adding extra items to it. Keeping in line with this definition, … Continue reading Decorator Design Pattern – Implementation in Java

Iterating over a list in Java

January 20, 2021 ~ Anjana Shankar

Iterating over a list is one of the most common tasks that is required for writing any program. This post will focus on the different ways of iterating over a List in java. It will cover the aspects that should be considered while iterating over the list using a particular method. For all the examples … Continue reading Iterating over a list in Java

Factory Design Pattern – Implementation in Java

January 5, 2021January 4, 2021 ~ Anjana Shankar ~ 3 Comments

After discussing Singleton Pattern and Observer Pattern in my previous posts, I will be talking about Factory Design Pattern in this one. What is a Factory Pattern? Factory Pattern is also among the most commonly used design patterns. Instantiating an object with the new() operator couples the code tightly to the concrete implementation leading to … Continue reading Factory Design Pattern – Implementation in Java

Observer Pattern – Implementation in Java

December 13, 2020 ~ Anjana Shankar ~ 4 Comments

What is an Observer Pattern? Observer Pattern is one of the most commonly used design patterns. It is useful when you are interested in getting notified of the state changes of an object. It defines a one-to-many relationship between the subject and the observers. Terminologies Observer or Listener or Subscriber The objects which are interested … Continue reading Observer Pattern – Implementation in Java

Singleton Pattern – Implementation in Java

November 22, 2020 ~ Anjana Shankar ~ 4 Comments

What is a singleton pattern? Singleton pattern is used in cases where we want to ensure that only a single instance of the class exists in the application. It is one of the most popular patterns. With lot of views around the web calling it a code smell. In this post I will not be … Continue reading Singleton Pattern – Implementation in Java

Variable Arguments in Java

July 11, 2020July 15, 2020 ~ Anjana Shankar

Variable arguments to a function in any language gives us a flexibility while calling the function. The number of arguments to a function are not fixed, and a number of calls can be made to the same function which would otherwise have been impossible without method overloading. Consider the following example: You have to write … Continue reading Variable Arguments in Java

The Magic of Final Keyword in Java

July 6, 2020July 9, 2020 ~ Anjana Shankar

In this post, we will discuss all things final in Java. Final Classes, Final Methods, Final Variables and finally Final Arguments. Final Classes Let us look at an example. We have a class A that is declared as final. https://gist.github.com/anjanashankar9/8adc9729a7b4d26d9bb110767b10d1fc Now let us try to create a subclass of A https://gist.github.com/anjanashankar9/5ad56b973687dab6c5bd60042ea5403a This will give a … Continue reading The Magic of Final Keyword in Java

How memory works in Java?

November 1, 2019January 24, 2020 ~ Anjana Shankar ~ Leave a comment

As a developer, it is extremely important to understand how memory management in java works. It can help avoid creating difficult to trace problems. This blog post would give a simplistic view of memory management in java. With respect to memory management of Java applications, you need to understand two terms, the stack and the heap. The memory … Continue reading How memory works in Java?