Q371. When would you use a sealed class instead of an enum?
An `enum class` defines a fixed set of constants, each a single instance. It can have properties and methods, but every constant shares the same shape. A `sealed class` o...
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Job Interview Questions and Answers Directory
Search and filter frequently asked interview questions across technical, programming, and behavioral domains. Tailor your interview preparation by difficulty for freshers or experienced developers (2,728 available).
Q372. How do generics and constraints work in C#?
Generics let you write type-safe, reusable code without boxing or casts. The type parameter is resolved at compile time, and the JIT specialises for value types while sha...
Q373. How do virtual functions, vtables and virtual destructors work?
A `virtual` function enables runtime polymorphism. Each polymorphic class gets a vtable of function pointers and each object stores a hidden vptr. A call through a base p...
Q374. How do traits compare with interfaces in other languages?
A trait defines shared behaviour: a set of method signatures a type can implement. Implementations can be written for types you did not define, as long as you own the tra...
Q375. How do interfaces work in Go, and what is the empty interface?
An interface is a set of method signatures. Any type that implements all of them satisfies the interface implicitly, with no `implements` keyword. Internally an interface...
Q376. You have 8 identical-looking balls; one is heavier. Using a balance scale, what is the minimum number of weighings to find it?
Two weighings. Weighing 1: split into 3, 3 and 2. Weigh the two groups of 3. - If one side is heavier, the heavy ball is in that group of 3. - If they balance, the heavy ...
Q377. Tell me about a time you had to learn something quickly.
Show a learning system, not just a story. Example: "We inherited a Go service with no tests and I had never written Go. I gave myself three days: I read the standard libr...
Q378. Tell me about a time you made a mistake.
Own it fully and show the learning. Use STAR but with the emphasis on accountability and change. Example: "I shipped a database migration without a rollback plan and a mi...
Q379. How would you find the K largest elements in an array?
Options and trade-offs: 1. Sort then slice: O(n log n) time, simplest, fine for small n. 2. Min-heap of size k: O(n log k) time, O(k) space. Preferred when k is small rel...
Q380. What is Spring dependency injection and why use it?
Dependency injection means a component receives its collaborators from outside rather than creating them itself. The Spring container builds and wires the object graph fr...