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Builder

The Builder design pattern offers a different perspective on how to create objects than the other GOF creational patterns. It mostly deals with the case when the constructor would have too many parameters and it'd, therefore, be problematic and unreliable to pass all these parameters. Builder often uses the Method Chaining pattern, but its principle lies mainly in separating the construction of an object into a separate builder object. There are multiple ways how to use Builder, we'll introduce more of them here and mention how it differs from the Factory and the Template Method patterns.

Motivation

It's easy to put a value in the wrong place when a method, most often the constructor, accepts for example 10 parameters. Parameters are separated by commas, and we don't include their names in most programming languages. That's why it often happens that we forget which is which:

Button button = new Button("Save", 100, 50, 2, Color.Blue, Icon.Disk, true, {"ctrl", "s"});

An even worse situation occurs when the method has some optional parameters and we have to find their default values to


 

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The Builder design pattern is often used for objects with a too complex constructor and separates the construction of the object into a separate builder.

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Article has been written for you by David Capka
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The author is a programmer, who likes web technologies and being the lead/chief article writer at ICT.social. He shares his knowledge with the community and is always looking to improve. He believes that anyone can do what they set their mind to.
Unicorn College The author learned IT at the Unicorn College - a prestigious college providing education on IT and economics.
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