Cracking the Tech Interview: System Design and Algorithms in Java 25

Technical interviews test a narrow, learnable skill set. This book maps that territory completely — from system design methodology and algorithm pattern recognition through every data structure category you will encounter, implemented and analyzed in Java 25.

Each part follows the same discipline: understand the invariants of the structure or technique, derive the complexity from first principles, then practice recognition so you can identify the right tool within seconds of reading a problem.

What You Will Master

• System Design at Scale: requirements decomposition, capacity estimation (QPS, storage), API design, data modeling, and partitioning strategy
• Algorithm methodology: pattern recognition for two-pointer, sliding window, divide-and-conquer, dynamic programming, and greedy approaches
• Linear structures: arrays, linked lists, stacks, and queues — including when each beats the alternatives
• Hash-based structures: open addressing, separate chaining, load factors, and the Java HashMap/TreeMap/LinkedHashMap internals
• Trees and graphs: traversal algorithms, BST operations, heaps, tries, Union-Find, Fenwick Trees, and Skip Lists
• Sorting and searching: lower bounds, stability trade-offs, and binary search extensions beyond sorted arrays
• Algorithm paradigms: DP with memoization and tabulation, greedy proofs, graph shortest-path algorithms, and string matching
• Essential techniques: bitwise operations and randomized algorithms that unlock elegant solutions to otherwise intractable problems