#what's the benefit to use this static factory method instead of constructor?

1 messages · Page 1 of 1 (latest)

clever python
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public static Country of( ❶
String name,
int population) {
Country country = new Country();
country.setName(name);
country.setPopulation(population);
return country;
}

I saw this example in the book spring start here, I don't understand why we just simply create a constructor and use Country c1 = new Country ("Name", population).

quartz flaxBOT
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<@&987246399047479336> please have a look, thanks.

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Here is an AI assisted attempt to answer your question 🤖. Maybe it helps! In any case, a human is on the way 👍. To continue talking to the AI, you can use </chatgpt:1108714622413963314>.

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There are several benefits to using a static factory method instead of a constructor:

  1. Naming: The static factory method can have a descriptive name that makes it clear what the method does, whereas constructors have to use the same name as the class.

  2. Caching: The static factory method can implement caching mechanisms to reuse objects instead of creating new ones every time. This can improve performance and reduce memory usage.

  3. Flexibility: The static factory method allows for flexibility in creating objects. It can return different subclasses or implementations based on certain conditions or parameters.

  4. Privacy: The static factory method can control the visibility of the constructor, making it private or protected and only allowing object creation through the factory method. This provides more control over object creation and can enforce certain rules or restrictions.

  5. Reduced verbosity: The static factory method can simplify object creation by providing default values for optional parameters or by using parameter names to make it clear what each argument represents.

Overall, using a static factory method gives more control, flexibility, and clarity in object creation compared to constructors.

oblique radish
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however, u could change the underlying implementation at any time, for example to make use of caching

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i.e. instead of always creating a new country, it could use some pre-created/memorized countries instead

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u cant do that with a constructor, since that will always create a new instance

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by using a factory for this today, its possible to introduce this feature later - without having to touch all call-sites/usages

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(this is especially important if this is library code)

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but yeah, its essentially what the bot summarized

tidal sorrel
quartz flaxBOT
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@clever python

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clever python
glossy cape
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