how verify the OneToMany relationship between two entities

Question

I have two entites Parent and Child with OneToMany relationship in Hibernate, Parent has many Childs, I want to check if the Parent has Childs or not

I used these conditions and they not working

if (parent.getChilds().size() == 0)

and

if (parent.getChilds.isEmpty())

Answer 1

Those are equivalent. If you look at source of, for example, ArrayList#isEmpty() you'll find

public boolean isEmpty() {
    return size == 0;
}