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I have the problem mentioned in the title. You could say that this thread duplicates another one: How do I turn off error validation for annotations in IntelliJ IDEA?
But the solution given there doesn't work. They say that I need to take the following action:
In the Project Structure | Project dialog, change the Project language Level to 6.0 - @Override in interfaces.
However, the Project language Level is 6.0 at the moment, but I still see the error.
Vic, here is the window and there is no JVM version right under Language level (unfortunately I can't post images because I have 10 reputation)
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If you have default method in an interface, it is not mandatory to override (provide body) it in the classes that are already implementing this interface. In short, you can access the default methods of an interface using the objects of the implementing classes.
No. Interface methods can be implemented. To overload/override a method, that method must be defined first.
Yes, it is mandatory to implement all the methods in a class that implements an interface until and unless that class is declared as an abstract class.
The @Override annotation indicates that the child class method is over-writing its base class method. The @Override annotation can be useful for two reasons. It extracts a warning from the compiler if the annotated method doesn't actually override anything. It can improve the readability of the source code.
If your project has multiple modules, also check that every module uses language level 6 or above, or use the project's language level (see Project Settings > Modules > xxx > Language level).
You may need to reload your project once it is modified.
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