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Do all methods in an Interface has by default Public visibility mode?
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All abstract, default, and static methods in an interface are implicitly public , so you can omit the public modifier. In addition, an interface can contain constant declarations. All constant values defined in an interface are implicitly public , static , and final .
An interface can have private methods since Java 9 version. These methods are visible only inside the class/interface, so it's recommended to use private methods for confidential code.
As defined, every method present inside interface is always public and abstract whether we are declaring or not. Hence inside interface the following methods declarations are equal. void methodOne(); public Void methodOne(); abstract Void methodOne(); public abstract Void methodOne();
In general, the protected members can be accessed in the same class or, the class inheriting it. But, we do not inherit an interface we will implement it. Therefore, the members of an interface cannot be protected.
All methods in an interface default to public.
See Java Language Specification 6.6.1 which states
All members of interfaces are implicitly
public.
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