Design patterns - Factory Pattern

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This presentation is part of the Design Pattern Series. Presentation explains the use of Factory Pattern comparing it against a real life situation and then showcasing the Java implementation of the same.

Technology Business

QmPe
initiative

FACTORY PATTERN explained !

Prepared by Annamalai C

Copyright 2006-2011

Factory Pattern in Real Life
Kitchen in a Restaurant is similar to a Factory.
It is the Production House of the Restaurant.
-----------------------------------
Customer places orders from a Menu, doesn’t really know how it gets prepared.
In return to the order, gets a fully cooked dish for eating.

Factory Pattern is a Creational Pattern.
It helps in Object Creation without exposing the details of Creation.

Copyright 2006-2011

Factory Pattern in Java

Copyright 2006-2011

Real Life vs Java Object

Factory

Kitchen

Copyright 2006-2011

Real Life vs Java Object

Copyright 2006-2011

How Factory Pattern works in Real Life ?

1 Orders a Dish from Menu

Receives the Name of the Dish
2 Creates the Dish

3 Delivers the Dish

Copyright 2006-2011

How Factory Pattern works in Java ?

public Food getFood(String name) {
if (name.equals("Dosa")) {
return new Dosa();
1 } else if (name.equals("Noodles")) {
return new Noodles();
}
return null;
}

KitchenFactory factory = new KitchenFactory();
Food dosa = factory.getFood("Dosa");
dosa.print();
2
Food noodles = factory.getFood("Noodles");
noodles.print();

Food

3
Dosa Noodles

Copyright 2006-2011

THANK YOU

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QmPe
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Copyright 2006-2011

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Design patterns - Factory Pattern

2. Factory Pattern in Real Life Kitchen in a Restaurant is similar to a Factory. It is the Production House of the Restaurant. ----------------------------------- Customer places orders from a Menu, doesn’t really know how it gets prepared. In return to the order, gets a fully cooked dish for eating. Factory Pattern is a Creational Pattern. It helps in Object Creation without exposing the details of Creation. Copyright 2006-2011

7. How Factory Pattern works in Java ? public Food getFood(String name) { if (name.equals("Dosa")) { return new Dosa(); 1 } else if (name.equals("Noodles")) { return new Noodles(); } return null; } KitchenFactory factory = new KitchenFactory(); Food dosa = factory.getFood("Dosa"); dosa.print(); 2 Food noodles = factory.getFood("Noodles"); noodles.print(); Food 3 Dosa Noodles Copyright 2006-2011

Design patterns - Factory Pattern

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