Category: Java

(The simplest, cleanest way — and why it’s more than enough in real-world systems) 🎯 What is an LRU Cache? An LRU Cache (Least Recently Used Cache) is a special type of cache that: Keeps a fixed number of elements (say, capacity = 100). Every time you access (read or write) a key, it becomes…

🎯 The Ultimate Guide to @Mock, @InjectMocks and @MockBean in Spring Boot Testing ✅ By the end, you’ll know exactly when to use each, how they work under the hood, and what you’re truly testing. 🚀 Why do we need mocks? When writing unit tests, you want to test your business logic in isolation, without…