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This is an example of the builder pattern diagram, so basically here we have the director class, which

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in our example is the object itself, the user accounts class, the user account for the only website,

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and it will have a reference to a builder class, which in our example will be coded as a static class.

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It can be also in the interface, but we will use it as an inner class and that's builder class will

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basically build without using complex constructors will basically build our our object.

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So let's dive into the code.

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Now.

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Let's analyze first the all I saw account object, so basically we have the same properties that we've

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seen before, but in addition to this, we have a static inner class like we see here, a builder,

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which has also the same the same properties as the the outer class.

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Right.

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But you will see the difference.

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So here we also have a constructor for this builder that accepts Nidhi.

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We decided to keep the idea in the constructor because the is pretty important.

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We don't want to allow the possibility of creating a user account without an idea.

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This may crash the application.

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So it's also about practice.

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So we will keep this one.

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This this property here in the constructor and for the rest of the properties we have Setas, we have

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defined centers that will return the object of this this builder.

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So we have a center for the name, for the address, for the budget and for the discount.

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And you can see that the probability of supplying wrong data is decreasing.

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Right?

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It's significantly decreased because you can see in the name of the method what type of parameter you

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need to supply so that this will lower the chances of making some some mistakes.

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And the final method in this builder in our class is the build method.

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So this will basically the build.

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This will build an online storico object and it will assign to each parameter the corresponding parameter

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for from the builder class, and it will also return the object itself.

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You can see that I have made the constructor of the online store account class private because we don't

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want someone that needs to create an online store account in the code to use the constructor of the

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object.

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We want to use the builder class instead.

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Right.

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So with the method.

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So also we have getters and setters, but these are not important because the actual getters and setters

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are inside the builder class here.

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So let's see this in action so we can see now that the the code that resulted from applying this builder

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pattern is a lot more stable.

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It's more readable, it has better readability.

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You can easily understand, even if you're not such a technical person, even if you show this code

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to someone that is non-technical, she or he will know what this what this means.

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Right.

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So we create an online store account with the name John Smith, and here we invoke the builder constructor,

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which requires an ID.

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So we supply ninety here and then we create we assign a name and address, a budget and also a discount

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using this pattern, using the builder class and also at the end we supply to build a method that will

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return the object that we created.

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The object of this type on my account.

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So let's see if this has done what it needed to do.

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So basically the system of print can and should output the name of this object and therefore we will

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see that the name was correctly stored in the object itself.

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So let's validate this.

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So you can see that the name is correctly outputted here, so everything went well and there are no

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issues.

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The properties were set as expected.

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That's it for the builder pattern.

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Join me in the next story where we are going to discuss about the factory pattern.

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So see you in the next tutorial.