I’ve got currently have 2 classes that do exactly the same, and are differentiated by a single member.

interface interfaceA {
    VariationA getVariation();
}
interface interfaceB {
    VariationB getVariation();
}

public class classC{
    private interfaceA interfaceImpl = new interfaceAImpl();
}
public class classD{
    private interfaceB interfaceImpl = new interfaceBImpl();
}

I’m looking for an elegant way to unite classA with classB

P.S.,

I have lombok and spring framework capabilities available.