5 questions for “Records & Sealed Classes”

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5 questions in 2 technologies

#	Question	Technology	Topic	Level
1	What are records in C#, and how do they differ from classes and structs? C# › Records & Pattern Matching	C#	Records & Pattern Matching	Beginner
2	How would you design a sealed interface (Java 17+) to restrict which classes are permitted to implement it, and what benefit does this provide over a traditional open (unrestricted) interface for exhaustiveness checking? Java › Interfaces & Abstract Classes	Java	Interfaces & Abstract Classes	Advanced
3	How would you implement the Visitor pattern in Java to add new operations to an existing class hierarchy without modifying those classes, and how do Java's sealed classes and pattern matching (switch expressions) provide a modern alternative? Java › Design Patterns in Java	Java	Design Patterns in Java	Advanced
4	How does the Builder pattern solve the "telescoping constructor" problem, and how would you implement it for a class with many optional parameters? Java › Design Patterns in Java	Java	Design Patterns in Java	Intermediate
5	How does Java Record's automatically-generated equals(), hashCode(), and toString() implementations work, and in what specific ways do they differ from a manually-written, field-by-field implementation? Java › equals(), hashCode() & toString() Contracts	Java	equals(), hashCode() & toString() Contracts	Advanced