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Asked: 2026-05-13T07:24:48+00:00

I have two questions regarding interfaces in Java. 1) If a class happens to

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I have two questions regarding interfaces in Java.
1) If a class happens to implement all the interface methods of interface I, without declaring itself as implementing them, can it still be used as input into variables of type I?
2) Does a subclass of class A which implements interface I inherits the conformance to that interface, or should it also declare itself as implementing I?

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  1. Editorial Team

    If a class happens to implement all
    the interface methods of interface I,
    without declaring itself as
    implementing them, can it still be
    used as input into variables of type
    I?

    No. What you’re describing is more akin to duck typing.

    Does a subclass of class A which
    implements interface I inherits the
    conformance to that interface, or
    should it also declare itself as
    implementing I?

    Assuming you mean:

    public class A implements I { /* ... */ }

public class B extends A { /* ... */ }

    In this case, B implements I.

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