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The importance of Composition | Code of Doom
Many times when we are designing our programs model, first thing most people, including myself, want to start doing is inheriting from other classes. This makes for a nice large hierarchical beast. Not...
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How and when to use Singleton classes | Code of Doom
It’s a pretty well known pattern, but I want to discuss what a Singleton class is first. In a nutshell, a Singleton class is a class that will only have one instance of the class. In certain cases, we...
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The Strategy Pattern | Code of Doom
I will get right to the point about this pattern. Everyone at some point in their code has a switch statement, that depending on the state of an object, you do some crap and it just looks like this: 1...
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Value Object Pattern ~ Java Stuff
Value Object In this chapter, we are going to take a detailed look at the Value Object Pattern. What is Value Object Pattern? The Value Object pattern provides the best way to exchange data across...
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Coding With Passion: Design Patterns in Java - Template Method
Introduction This is first article about OO design patterns, we will start with the most useful pattern. Template method (GoF - Gang Of Four) present good example of using concrete inheritance. If you...
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Abstract Factory Vs Factory Method
I'm finding myself getting a bit muddled by these two patterns while reading DesignPatternsBook. Both classes have abstract classes (Abstract Factory, Abstract Product in Abstract Factory &...
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Abstract Factory vs Factory Method - DoFactory
I believe I have a good understanding of the difference between Abstract Factory and Factory Method, but I'd like to see what others think. When I say Abstract I am referring to...
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Template Method Design Pattern in Java
Template Method design pattern 01 Standardize the skeleton of an algorithm in a base class “template” method Common implementations of individual steps are defined in the base class Steps requiring...
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Design Patterns And Enterprise Patterns | Nilesh Gule's Technical Blog
Design Patterns are solutions to the recurring problems. There are different types of patterns. The most basic ones are the Design Patterns. Then there are higher level patterns like Enterprise Design...
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Factory Method Design Pattern
A factory method pattern is a creational pattern. It is used to instantiate an object from one among a set of classes based on a logic. Assume that you have a set of classes which extends a common...
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What is Dependency Injection | Tech Samosa
Definition Precisely, Wikepedia says Dependency injection is a software design pattern that allows a choice of component to be made at run-time rather than compile time. This can be used, for example,...
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Design Patterns Uncovered: The State Pattern
Today’s pattern is the State pattern, which allows objects to behave in different ways depending on internal state. State is used when you need a class to behave differently, such as performing...
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Design Patterns Uncovered: The Builder Pattern
The purpose of the builder pattern is to separate the construction of a complex object from its representation. so that the same construction process can create different representation. An example of...
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Design Patterns Uncovered: The Flyweight Pattern
Today’s pattern is the Flyweight pattern, used to share large number of objects in an efficient way.Flyweight in the Real World The classic example of the Flyweight pattern is the representation of a...
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Design Patterns Uncovered: The Bridge Pattern
Today’s pattern is the Bridge pattern, which allows you to vary both the implementation and the abstraction by placing both in seperate class hierachies.Bridge in the Real World The display of...
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Design Patterns Uncovered: The Composite Pattern
Today’s pattern is the Composite pattern, which comes into play when developing a system where a component could either be an individual object or a representation of a collection of objects.Composite...
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Design Patterns Uncovered: The Template Method Pattern
Today’s pattern is the Template Method pattern, which defines a stub for an algorithm, deferring some implementation steps to subclasses.Template in the Real World The Template Method pattern is used...
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Design Patterns Uncovered: The Singleton Pattern
The next pattern in our series is the Singleton pattern. Singleton is probably the most infamous pattern, as it’s use causes a divide in the development community- some say it belongs, others say it’s...
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Introduction To Design Patterns
Pattern is a defined, used and tested solution for a know problem. Design patterns is all about re-use. Software design patterns evolved as a subject of study only when object oriented programming...
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Visitor « Java Code Samples
Description: Is a way of separating an algorithm from an object structure on which it operates. A practical result of this separation is the ability to add new operations to existing object structures...
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20 Design pattern and Software design interview questions for Programmers
Design patterns and software design questions are essential part of any programming interview, no matter whether you are going for Java interview or C# interview. In face programming and design skill...
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David Blevins' Blog: Interceptor Advisor Pattern
Your standard CDI/EJB Interceptor example uses a logger as an around advice. Generally this gives you an interceptor that looks like so: @Log public class LoggingInterceptor { private...
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Design Pattern – Observer (Part 02)
uaihebertLeave a Comment Hello, how are you? Let us keep talking about the Observer pattern. If you did not read the first post about this pattern, read it before reading the Part 2 about this pattern...
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Design Pattern – Observer (Part 01)
uaihebertLeave a Comment Hello, how are you? Today we will talk about another Design Pattern, “Observer”. If you want to see the first design pattern that we studied you can see it here (Strategy). Let...
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Top Java design pattern interview questions for programmer
Questions from design pattern and software design are always have places in most programming interviews doesn't matter its Java or C#. This become even more important if you are going for application...
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