Zena  Sporer

Zena Sporer

1596190560

Design Patterns — Decorator Design Pattern

Introduction

The decorator design pattern is a software design pattern that helps you add responsibilities to an object at runtime. This pattern is considered to be a structural design pattern. This type of pattern focuses on the relationships between classes and how they can help solve specific problems.

The Gang of Four, in their book Design Patterns: Elements of Reusable Object-Oriented Software, defined the intent of decorator pattern like this:

Intent:_ Attach additional responsibilities to an object dynamically. Decorators provide a flexible alternative to subclassing for extending functionality._

One of the key characteristics of this design pattern is that it follows the Single Responsibility Principle (SRP). This is because each “decoration” you add to an object, will be encapsulated within a class. This class’s responsibility will be to handle everything related to adding that decoration to that object.


Time to assemble a 🍔

For purposes of learning the decorator pattern, let’s assume you want to create an object of type Hamburger.

How a hamburger is assembled varies. According to Burger King, there are 221,184 possible ways to order a Whopper. It will take you at least 200 years to eat these many hamburgers if you were to eat one hamburger for breakfast, lunch, and dinner! The possibilities are endless.

In a world without the decorator pattern, an approach you might take is to create a parent Hamburger class and then subclasses for the different types of hamburgers. This could easily become a maintenance headache as it will make troubleshooting more difficult due to the complexity of multiple levels of inheritance.

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Design Patterns — Decorator Design Pattern
Samanta  Moore

Samanta Moore

1623835440

Builder Design Pattern

What is Builder Design Pattern ? Why we should care about it ?

Starting from **Creational Design Pattern, **so wikipedia says “creational design pattern are design pattern that deals with object creation mechanism, trying to create objects in manner that is suitable to the situation”.

The basic form of object creations could result in design problems and result in complex design problems, so to overcome this problem Creational Design Pattern somehow allows you to create the object.

Builder is one of the** Creational Design Pattern**.

When to consider the Builder Design Pattern ?

Builder is useful when you need to do lot of things to build an Object. Let’s imagine DOM (Document Object Model), so if we need to create the DOM, We could have to do lot of things, appending plenty of nodes and attaching attributes to them. We could also imagine about the huge XML Object creation where we will have to do lot of work to create the Object. A Factory is used basically when we could create the entire object in one shot.

As **Joshua Bloch (**He led the Design of the many library Java Collections Framework and many more) – “Builder Pattern is good choice when designing the class whose constructor or static factories would have more than handful of parameters

#java #builder #builder pattern #creational design pattern #design pattern #factory pattern #java design pattern

Zena  Sporer

Zena Sporer

1596190560

Design Patterns — Decorator Design Pattern

Introduction

The decorator design pattern is a software design pattern that helps you add responsibilities to an object at runtime. This pattern is considered to be a structural design pattern. This type of pattern focuses on the relationships between classes and how they can help solve specific problems.

The Gang of Four, in their book Design Patterns: Elements of Reusable Object-Oriented Software, defined the intent of decorator pattern like this:

Intent:_ Attach additional responsibilities to an object dynamically. Decorators provide a flexible alternative to subclassing for extending functionality._

One of the key characteristics of this design pattern is that it follows the Single Responsibility Principle (SRP). This is because each “decoration” you add to an object, will be encapsulated within a class. This class’s responsibility will be to handle everything related to adding that decoration to that object.


Time to assemble a 🍔

For purposes of learning the decorator pattern, let’s assume you want to create an object of type Hamburger.

How a hamburger is assembled varies. According to Burger King, there are 221,184 possible ways to order a Whopper. It will take you at least 200 years to eat these many hamburgers if you were to eat one hamburger for breakfast, lunch, and dinner! The possibilities are endless.

In a world without the decorator pattern, an approach you might take is to create a parent Hamburger class and then subclasses for the different types of hamburgers. This could easily become a maintenance headache as it will make troubleshooting more difficult due to the complexity of multiple levels of inheritance.

#design-patterns #java #software-engineering #decorator-pattern #programming

Joseph  Murray

Joseph Murray

1624442940

Prototype Design Pattern - Java

Prototype design pattern tutorial

Definition of Prototype pattern

The prototype pattern is a creational design pattern in software development. It is used when the type of objects to create is determined by a prototypical instance, which is cloned to produce new objects.

Where to use the Prototype pattern

If the cost for creating a new object is expensive and costs resources.

#java #design-patterns #code #tutorial #prototype-design-pattern #design pattern

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Joseph  Murray

Joseph Murray

1624442280

Factory design pattern — Java

Definition of the Factory pattern

In class-based programming, the factory method pattern is a creational pattern that uses factory methods to deal with the problem of creating objects without having to specify the exact class of the object that will be created. This is done by creating objects by calling a _factory method _— either specified in an interface and implemented by child classes, or implemented in a base class and optionally overridden by derived classes — rather than by calling a constructor.

Where to use the Factory pattern

  • When a class doesn’t know what sub-classes will be required to create
  • When a class wants that its sub-classes specify the objects to be created.
  • When the parent classes choose the creation of objects to its sub-classes.

#factory-design-pattern #code #tutorial #design-patterns #java #factory design pattern — java