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#Product builder java how to

#Product builder java how to

The Builder design pattern describes how to solve such problems: This makes it impossible to change the representation of the object later without changing the class. If we need to create object with different set of parameters we can not do with same constructor. If we want to create an object of this class, we need to pass all the parameters of the constructor. Let's say we have a class with parameterized constructor with some parameters.

How can a class that includes creating a complex object be simplified?Ĭreating and assembling the parts of a complex object directly within a class is inflexible.

How can a class (the same construction process) create different representations of a complex object?.

The Builder design pattern solves problems like: Where to use Builder pattern? What to solve? Thus, it provides flexible solution to object creation problems.

For example baking a bread, making burger patty, making different sauces, cutting of vegetables etc.īuilder pattern separates these 2 steps so that we can create different type of products using the same set of steps.

Construction: whereas, this step means how the parts of the products are actually made.

For instance first there is a bread, then patty on top it followed by some veggies, then some sauces and at the end finished off with final layer of bread.

Representation: This step consists of how our product looks at the end when it is ready. In this step we combine the already constructed parts.

What is construction and representation of an object? In case of programming this is where the Builder pattern comes into picture.īuilder pattern can be defined as, a design pattern that separates the construction of a complex object from its representation.

There they notice that burger making involves different processes, like toasting the bread, creating patty for burger, making sauces and then everything is put together. Also there are many different people present in the outlet who are ordering different types of burgers. Becky orders for a classic cheese burger but Sam is on a diet and hence goes for a veggie variation of the burger 😛. On their way they see a burger outlet and decide to stop for a snack. So our friends Becky and Sam decide to go for a long drive. Let’s understand the builder pattern with our example for burger. It is similar to making an object of a class in Object Oriented Programming for example navigation menu of any application.

For instance, consider assembling a car or making a burger. Builder design pattern is one of the most important and simple design pattern in java.