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Can two interfaces be implemented?
If two interfaces contain a method with the same signature but different return types, then it is impossible to implement both the interface simultaneously. It is a compile-time error to declare two methods with override-equivalent signatures in a class.
Can you implement two interfaces in Java?
A Java class can implement multiple Java Interfaces. It is necessary that the class must implement all the methods declared in the interfaces. The class cannot implement two interfaces in java that have methods with same name but different return type.
Can we override in interface?
So, at least in java8, you should use @Override on an implementation of an interface method. is clearly referring to an abstract super class; an interface can not be called the supertype. So, @Override is redundant and not sensible for interface method implementations in concrete classes.
Can a class implement more than one interface?
Your class can implement more than one interface, so the implements keyword is followed by a comma-separated list of the interfaces implemented by the class. By convention, the implements clause follows the extends clause, if there is one.
Can a class implement both interfaces in the same class?
If both interfaces have a method of exactly the same name and signature, the implementing class can implement both interface methods with a single concrete method. However, if the semantic contracts of the two interface method are contradicting, you’ve pretty much lost; you cannot implement both interfaces in a single class then.
Is there a way to delegate multiple interfaces?
There is one way to implement multiple interface. Unfortunately: NO. There’s no pretty way. You might be able to use a proxy with the handler having the target methods and delegating everything else to them. Of course you’ll have to use a factory because there’ll be no constructor.
Which is an example of explicit interface implementation?
Explicit interface implementation also allows the programmer to implement two interfaces that have the same member names and give each interface member a separate implementation. This example displays the dimensions of a box in both metric and English units.
What happens if two methods have the same implementation in Java?
As far as the compiler is concerned, those two methods are identical. There will be one implementation of both. This isn’t a problem if the two methods are effectively identical, in that they should have the same implementation. If they are contractually different (as per the documentation for each interface), you’ll be in trouble.