Nathan Agarwal

1608005169

What is the Singleton Pattern? (Software Design Patterns)

In this video, learn why the Singleton Pattern is such an important design pattern. We tell you what the
singleton pattern is, how it works, and explain it with an example.

Code: https://github.com/beabetterdevv/DesignPatterns/tree/master/patterns

Subscribe : https://www.youtube.com/channel/UCraiFqWi0qSIxXxXN4IHFBQ

#singleton #design-pattern

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What is the Singleton Pattern? (Software Design Patterns)
Seamus  Quitzon

Seamus Quitzon

1601479980

Confused With Java Singleton Design Pattern? Have a Look at This Article.

What Is a Singleton Design Pattern?

  1. Singleton design pattern allows us to create only one instance of a class and make sure that there exists only one Object in JVM.
  2. Singleton class must have a public static method to get the instance of the class from anywhere in the application [from different classes, different packages, etc].
  3. Singleton class must have a private constructor to instantiate the object of the class.
  4. Singleton class must have a private static variable of the same class which is the only reference of the class[basically this variable will point to only Object of class].

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Singleton Design Pattern

All these different implementation methods lead to one goal that is having a single instance of a class at any given point of time in JVM. Let’s see different implementation approaches for the Singleton design pattern


1. Eager Initialization :

  1. This is the simplest implementation of the singleton design pattern class. In this method, the private static variable of the same class [reference] is assigned the object of class at the time of loading the class into the JVM memory.
  2. This type of implementation is applicable to the scenarios when we always want the instance of the class.

Let’s see the program to understand this …

package com.vikram;

	public class EagerSingleton {
	    //Only object created when class is loaded and theInstance is private static var pointing to it.
	    private static EagerSingleton theInstance = new EagerSingleton();

	    //private constructor
	    private EagerSingleton(){

	    }
	    //public method to return single instance of class .
	    public static EagerSingleton getInstance(){
	        return theInstance;
	    }
	}

Eager Initialization

#desing-pattern #classloading #singleton-pattern #singleton-design-pattern #java-singleton-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

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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Nathan Agarwal

1608005169

What is the Singleton Pattern? (Software Design Patterns)

In this video, learn why the Singleton Pattern is such an important design pattern. We tell you what the
singleton pattern is, how it works, and explain it with an example.

Code: https://github.com/beabetterdevv/DesignPatterns/tree/master/patterns

Subscribe : https://www.youtube.com/channel/UCraiFqWi0qSIxXxXN4IHFBQ

#singleton #design-pattern