Java 15 new features | sealed classes in java 15 | Java Beam

Sealed classes and interfaces restrict/limit, which other classes or interfaces may extend or implement them. It enhance the Java programming language with sealed classes and interfaces.

A class can be sealed by using the sealed modifier - permits to its declaration. After which any extends and implements clauses, the permits clause specifies the classes that are permitted/allowed to extend the sealed class.

Example: Below example shows how Animal class specifies three permitted subclasses:

public sealed class Animal
permits Dog, Monkey, Leopard {...}

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