@FunctionalInterface
private interface myFunctionType<R> {
    R execute() throws Exception;
}

private <T> T methodCaller(final myFunctionType<T> operation) {
     return operation.execute();
}

public T createAnimal(int age) {}
public T createLamp(String style, boolean secondHand) {}

methodCaller(() -> createAnimal(5));
methodCaller(() -> createLamp("plain", true));