Using superclass "protected final" methods to keep common code for subclasses

As a (pedantic) beginner Java programmer I would like to know, is it a good practice to move a common block of code that all subclasses use to a separate protected (final) method in parent class? Tasks like filling lists with common values, or common filtering algorithms, etc... Is it good to also use protected static methods?

class A {
    protected final List<String> getVariants() {...}
    protected final List<String> filterResults(List<String> variants) {...}
}

class B extends A {
    public List<String> doSomethingUsefull() {
        List<String> commonVariants = getVariants();
        ...
        return filterResults(commonVariants);
    }
}

class C extends A {
    public void doSomethingUsefull() {
        List<String> commonVariants = getVariants();
        ...
        return filterResults(commonVariants);
    }

    public void doMoreUsefullThings() {
        List<String> commonVariants = getVariants();
        ...
        return filterResults(commonVariants);
    }
}