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Part 21 of 28

Machine Coding Case Studies, Part 1: Parking Lot, LRU Cache, Rate Limiter, Vending Machine (Java, via a Shopping Mall)

Four classic machine-coding rounds solved in modern Java through one neighbourhood shopping mall: the basement parking lot, the front-shelf LRU cache, the food-court token bucket, and the snack vending machine, each with design reasoning and follow-ups.

Created 2026-09-29 · Updated 2026-10-15 · System Design

Part 22 of 28

Machine Coding Case Studies in Java, Part 2: A Weekend Hotel Trip with Splitwise, Elevator, Tic-Tac-Toe, Logger, and Design Sketches

One weekend hotel trip, told in modern Java: expense sharing with debt simplification, a lift scheduler, tic-tac-toe with O(1) win checks, a pluggable trip diary (logger), plus class sketches for seat booking, notifications, a library, cab dispatch, food delivery, and chess.

Created 2026-09-29 · Updated 2026-10-15 · System Design