item 54 JungHyunLyoo - JAVA-JIKIMI/EFFECTIVE-JAVA3 GitHub Wiki

if(Objects.nonNull(value)){
    //exec
}

public List<Cheese> getCheeses() {
    return cheesesInStock.isEmpty() ? Collections.emptyList() : new ArrayList<>(cheesesInStock);
}

public static final <T> List<T> emptyList() {
    return (List<T>) EMPTY_LIST;
}

public static final List EMPTY_LIST = new EmptyList<>();

private static final Cheese[] EMPTY_CHEESE_ARRAY = new Cheese[0];

public Cheese[] getCheeses() {
    return cheesesInStock.toArray(EMPTY_CHEESE_ARRAY);
}