Question

I’m trying to understand when can I use the enums in Java.

So, let’s say I have three enums values :

enum Activity {
    STUDENT, MECANICIAN, TEACHER
}

How can make use of this enum class in an existing Person class ? How is it persisted in a database?

class Person {
    private String name;
    private String age;
    private String activity; // !!!
}

Thank you.

Answer 1

Just add the enum to Person:

class Person {
    private String name;
    private String age;
    private Activity activity; 
}

One way to persist this field is to use an ORM such as Hibernate, for example:

    @Enumerated(EnumType.STRING)
    private Activity activity; 

would map the field to a text type field in the database.