I have a parent p1 associated with a set of children (c11,c12,c13...).
I have another parent p2 associated with another set of children (c21,c22,c23...)

All the above are persisted instances.

What is the best approach to swap parents?

I want to do something like p1 associated to c21,c22,c23 and p2 associated to c11,c12,c13.

I have the following Parent/Child class.

class Parent {

private Set<Child> children;

}

class Child {
private Parent parent;

}


Can anyone help me with a piece of code snippet to do the swapping?