— Choose Your Volume —
Java OOP
&
Collections
Eighty-five questions. Fifty code snippets. Twelve core topics. Two volumes of preparation, written for the engineer who refuses to memorise without understanding.
Volume I
Four Pillars & Collections
OOP fundamentals, abstract versus interface, HashMap internals, the Big-O cheat sheet, and the coding round patterns Xperi adores.
12 Chapters · 60 Q&A→
Volume II
Generics, Streams & Patterns
Type erasure, the exception hierarchy, Java 8 streams, the design patterns Xperi asks, multithreading, and the rapid-fire revision.
6 Chapters · 30 Q&A→