Computer scienceProgramming languagesJavaCode organizationObject-oriented programmingClass hierarchiesOverriding methods

Covariant return types

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Which situations described below are correct according to the covariant return types principle?

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If the superclass method returns A, then an overriding subclass method can return B when A extends B.

If the superclass method returns A, then an overriding subclass method also can return A.

If the superclass method returns int, then an overriding subclass method can return long.

If the superclass method returns long, then an overriding subclass method can return int.

If the superclass method returns A, then an overriding subclass method can return B when B extends A.

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