How have recent updates in Java (like records, sealed classes) impacted object-oriented programming principles?

Question

Accepted Answer

Recent Java features such as Records and Sealed Classes have strengthened object-oriented design by reducing boilerplate code, improving immutability, and providing better control over inheritance. These enhancements allow developers to build cleaner, safer, and more maintainable applications while still adhering to core OOP principles like encapsulation, abstraction, and polymorphism.

Key Points:
• Records simplify the creation of immutable data objects by automatically generating constructors, getters, equals(), hashCode(), and toString() methods.
• Sealed Classes restrict inheritance to a predefined set of subclasses, providing stronger control over class hierarchies and improving type safety.
• These features reduce unnecessary code, improve readability, and help developers focus on business logic rather than repetitive implementation details.

Example:
In a payment system, a Payment class can be declared as sealed and allow only CreditCardPayment, UpiPayment, and NetBankingPayment subclasses. Similarly, a Customer record can represent immutable customer information without writing boilerplate code.

Code Example:
```
public record Customer(
```
        Long id,
```
        String name) {
}

public sealed class Payment
```
        permits CreditCardPayment,
```
                UpiPayment {
}

final class CreditCardPayment
        extends Payment {
}

final class UpiPayment
        extends Payment {
}
```
Interview Tip:
A concise interview answer is: Records and Sealed Classes modernize Java OOP by promoting immutability, reducing boilerplate code, and providing controlled inheritance. Records simplify data-carrying objects, while Sealed Classes improve type safety by restricting which classes can extend a hierarchy, resulting in cleaner and more maintainable designs.