Add and Remove
We have seen how we can create add and remove methods for @ManyToOne relationships. We can apply the same concept to @ManyToMany.
- Each side of the relationship stores a collection of the opposite side. Therefore, we are going to need
addandremovemethods in both entities. - You must ensure, for data integrity, that the entity is added or removed from both collections.
Example Using Actor and Film¶
Practice Exercise¶
In order for the collection's contains method to work properly your class must have a equals method implemented.