GuideTechnology
12 min read
Why two objects that look identical are not equal by default, what == really compares, how to write equals and hashCode correctly, why mutable keys break HashSet and HashMap, and how immutability makes all of this safer. Includes the Integer cache surprise and the contracts interviewers ask about.
GuideTechnology
13 min read
Starting from a payment system full of if-else branches, this article shows why interfaces and polymorphism exist, how abstract classes differ from interfaces, what default methods are for, and why composition usually beats inheritance. It also previews the idea behind dependency injection.
GuideTechnology
11 min read
How one Java class can build on another, how overriding changes behaviour at runtime, how overloading is chosen at compile time, and why inheritance is easy to misuse. With the constructor-order trap, field hiding and the exact differences interviewers ask about.
GuideTechnology
14 min read
Turn the course into interview performance: an eight-week practice plan, how to run timed solo drills and mock interviews, a self-scoring rubric that separates SDE-1 and SDE-2 expectations, a drill sheet for the twelve classic problems, ten new practice problems to test transfer, common failure patterns, and the complete job-ready checklist.
GuideTechnology
14 min read
A practical, repeatable way to run a 45-minute system design interview: what interviewers typically evaluate, a 21-item checklist grouped into seven phases, a time plan, phrases for clarifying, estimating and stating trade-offs, how to handle hints and pushback, how SDE-1 and SDE-2 expectations differ, and a compact worked example.
GuideCareer
10 min read
An AI assistant can be a patient, always-available interviewer: asking questions, probing your answers and giving feedback on structure and clarity. It can also flatter you and mark wrong answers right. This article gives a mock-interview protocol for behavioural and technical rounds, and clear rules about not using AI in the real interview.
GuideCareer
5 min read
Most candidates prepare randomly and burn out. This six-week plan covers coding problems, fundamentals, system design basics, behavioural answers and mock interviews, with realistic daily time.
