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Problems of multiple inheritance

Published on 2024-11-09
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Problemas da herança múltipla

  • Java does not support multiple inheritance of classes, and standard methods do not circumvent this restriction, as classes can maintain state (with instance variables), but interfaces cannot.

  • Default methods provide a limited form of multiple inheritance of behavior, allowing a class to inherit behaviors from multiple interfaces with default methods.

  • Conflicts can occur when two interfaces implemented by a class have the same default method, as in the case of two interfaces, Alpha and Beta, both with the reset() method.

  • Rules for resolving conflicts:

  • 1 The class implementation takes priority over the default interface implementation.

  • 2 If two interfaces have the same default method and the class does not override the method, an error will occur.

  • 3 If one interface inherits another and both define the same default method, the version of the inherited interface takes precedence.

  • To explicitly reference a standard implementation of an interface, you can use the syntax: NameInterface.super.NameMethod().

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