Part - 28 Composition | National Railway System in Java | Java OOPs

You scrap Train KL-2401 — and every single Compartment inside it is gone with it. The Compartments don't walk off to another train. They don't survive on their own. They live because the Train lives — and they die when it dies.
In this part — we explore Composition, the strongest form of HAS-A relationship in Java OOPs. We see how a Train completely owns its Compartments with a shared, unbreakable lifecycle. We understand exactly why a Compartment cannot be created, accessed, or held by anything outside the Train object. We trace the full destruction chain — destroy the Train object in Java, every Compartment object is gone with it. We compare Composition directly against Aggregation to feel the difference between a weak HAS-A and a strong one.
This is Part 28 of a 105-part series building a complete National Railway Management System in Java from zero.
Follow the series to build the full system — one concept at a time.

#dsa #hashmap #hashset #hashtable #algorithms #leetcode #leetcodedaily #codinginterview #faangpreparation #bigo #timecomplexity #competitiveprogramming #softwareengineering #datastructures #visuallearning #algorithmpatterns #interviewpreparation #javatutorial #javaforbeginners #oops #oop #oopsinjava #javaprogramming #learnprogramming #codingshorts #programmingtips #javadev #100daysofcode #techeducation #programminglife #codingtips #javarailway #composition #compositioninjava #hasarelationship #objectlifecycle #javarelationships #aggregationvscomposition #oopconcepts #javaoopsconcepts #oopdesign #classdesign #javaseries #objectdestruction

Видео Part - 28 Composition | National Railway System in Java | Java OOPs канала Visually Inclined