Nineth Chapter Interface

Source: Internet
Author: User
  1. You can add the Public keyword before the interface keyword (but only if the interface is defined in a file with the same name). If you do not add the public keyword, it only has package access so that it is available only within the same package, and the interface can contain fields, but these fields are implicitly static and final.
  2. You can choose to explicitly declare a method public in an interface, but even if you do not do so, they are public. Thus, when an interface is to be implemented, the methods defined in the interface must be defined as public, otherwise they will only get the default package access, so that in the process of integrating the method, the access permissions are reduced, which is not allowed by the Java compiler.

Nineth Chapter Interface

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