CHAPTER 7
Many-Valued Associations
A many-valued association is by definition a collection of references to entities. The collection can be of type List, Set, Map, and so on in Java.
Why would you have a collection of references? When there is a parent/child relationship, and one parent can be associated to many children, the parent contains a collection of references to the child entities. In a relational model, suppose that two tables are dependent on each other; this relationship can be represented as a foreign key column in the dependent table. For one row in the parent table, many rows exist in the child table.
You saw the use of relationships ...
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