Dependency Injection & IoC Explained | Loose Coupling in Spring | Spring Boot Full Course #4

In this lecture of our Spring Framework series, we will understand three of the most important concepts in Spring Core: Dependency Injection, Inversion of Control, and Loose Coupling. Before jumping into Spring annotations and Spring Boot magic, it is very important to understand why Spring Core was needed in the first place. In this video, we will learn: What is tight coupling? Why directly creating dependencies inside a class is a problem How interfaces help in loose coupling Why interface alone is not enough What is Dependency Injection? Constructor Injection vs Setter Injection What is Inversion of Control? Relationship between IoC and DI What is Spring IoC Container? What are Spring Beans? How Spring manages object creation and dependency wiring This lecture builds the foundation for understanding Spring Core deeply. Once you understand DI and IoC properly, Spring annotations like @Component, @Autowired, @Bean, and the Spring IoC Container will start making much more sense. If you are learning Spring Framework or Spring Boot as a Java backend developer, this is one of the most important lectures in the series. JAVA Beginner to Advance Series :    • Java Full Course 2026   Join System Design WhatsApp Group: https://www.whatsapp.com/channel/0029... Code and Notes: Github : https://github.com/adityatandon15/Spr... We have paid courses on DSA, Web Development , Blockchain, System Design & GenAI. Join Courses: https://strikes.in/ Coder Army Website: https://coderarmy.in/#home Coder Army App: https://play.google.com/store/apps/de... Connect with Aditya Tandon Instagram :   / adityatandon2   LinkedIn :   / adityatandon2   Twitter : https://x.com/adityatandon02 Timestamps: 00:00 Intro 01:00 Creating new Project 02:30 Tightly coupled design 09:40 Creating Interfaces for Loose Design 16:57 Dependency Injection 30:47 Inversion of Control 34:25 DI and IOC Relationship 36:12 Role of Spring Framework