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The template method pattern provides a framework for implementing an algorithm, providing a default

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implementation that can be later on modified in subclasses.

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Let me clear this out a little bit, suppose that you need to create an algorithm for assembling a computer.

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Essentially, you have a method for replacing the motherboard, a method for assembling the memory to

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the motherboard, one for attaching the processor, so on and so forth for all the other components

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of a computer.

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Using this pattern, we provide a common way for assembling a computer, but if something in the architecture

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of a computer changes, we can modify that template class in a subclass.

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But essentially the sequence of operations will remain the same.

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Here is the UML diagram for this pattern.

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We have the computer template, abstract class alongside all its methods.

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We extend this class in a tower, computer class and a quantum computer class.

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Those two classes will extend the template class, however, they will provide some elements that are

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specific to their types.

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