A more practical example of a standard method

• 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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