The practice lab

From code to reasoning.

Build your skills with structured courses, worked exercises and practice exams. Choose a technology or a focused quiz, then take the time to understand each decision.

Practical scenariosExplained answersFree access, no account needed

Learning paths

Full course

Java SE 21 — préparation OCP

Apprenez à analyser le code Java, concevoir des objets, exploiter les collections et streams, maîtriser concurrence, fichiers et modules. Huit laboratoires et un examen blanc original.

8 modules with exercisesJava SE 21
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Standalone quizzes and simulations

Experienced / senior

Payment Interview Lab · Series 01

Payments mission — PHP, Java and Apple Pay

Prepare for a payments role with 20 practical scenarios: PHP 8.4 without a framework, Java / Spring Boot, Apple Pay, SQL architecture and security. Choose five focused tests or a full mock interview, with notes and recruiter follow-up questions.

  • PHP
  • Java
  • Spring Boot
  • Payments
  • Architecture
  • PostgreSQL
  • Security
Format
20 questions
Suggested duration
50–60 min
Question language
French
Start the quiz