Закрытые классы и интерфейсы (Sealed Classes)
🔒 Sign in to use this
Sealed classes and interfaces (Java 17, JEP 409) let you declare exactly which classes may extend or implement them. They enable closed, exhaustive type hierarchies — the compiler knows all subtypes, enabling safe exhaustive pattern matching.
Sealed Class Declaration
Content is available with subscription.
Get full access to all courses on the platform for one year with a single payment.
▼
▼
Unlike other platforms that charge per course, here you get everything for one price, and after one year of use there will be no automatic charge for the following year.
🔒 Sign in to use this