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The visitor pattern makes use of a visitor class, which changes the behavior of an element class.

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This way, the algorithm choosing for execution can vary when the visitor varies.

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This pattern comes under the behavioral pattern category.

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As part of the pattern, the element object has to accept the visitor object so that the visitor object

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handles the operation on the element object.

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Let's have a look in the diagram.

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And don't worry if this looks too complex, the visitor pattern is actually really easy to understand.

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We can see that we got to interfaces, vehicle part and vehicle part visitor.

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The vehicle part is implemented by parts of a vehicle and by the vehicle class as well.

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This construct is used for building a new vehicle.

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The visitor pattern interface is implemented by a single show, Visitor Concrete Glass, which outputs

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the name of each vehicle component.

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You can have as many vehicles as you want for any type of action.

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Let's see how this looks like in the code.