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A more practical example of a standard method
- Susan SarandonOriginal
- 2024-10-09 06:09:02537browse
The previous example showed the use of standard methods, but not in a practical scenario.
The Series interface was widely used, with many programs dependent on it.
It was discovered that several Series implementations added a method that returns an array with the next n elements of the series.
It was decided to improve the Series interface with the getNextArray(int n) method, where n specifies the number of elements to be retrieved.
Before standard methods, adding this method would break existing code that did not define it.
With standard methods, the new method can be added to the Series interface without causing problems in existing codes.
In some cases, standard methods added to an interface report an error if used, when it is not possible to provide an implementation that works in all situations.
These default methods define optional code.
In certain cases, a default method can be defined to work in any situation.
The getNextArray() method is an example, as it can be implemented using the getNext() method already required by the Series interface.
It is possible to implement the new version of Series with the standard getNextArray() method.
The standard getNextArray() method is implemented using the getNext() method, already present in the original Series specification.
Any class that implements Series can use getNextArray() without having to override the method.
Existing codes will not be invalidated by adding getNextArray().
Classes can provide their own implementation of getNextArray() if necessary.
Advantages of the standard method:
Allows interfaces to evolve without invalidating existing code.
Provides optional functionality without requiring a placeholder implementation.
In the case of getNextArray(), if a Series implementation does not need the method, it does not need to provide a placeholder implementation, resulting in cleaner code.
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