19. Dependency Injection and Inversion of Control
Dependency Injection (DI) and Inversion of Control (IoC) are essential design principles that enhance modularity, testability, and scalability in Java applications. They empower developers to manage dependencies efficiently, foster loose coupling, and promote code reusability. Various DI types like constructor injection, setter injection, and field injection are explored alongside hands-on implementations, particularly within the Spring Framework, highlighting their significance in modern software development.
Enroll to start learning
You've not yet enrolled in this course. Please enroll for free to listen to audio lessons, classroom podcasts and take practice test.
Sections
Navigate through the learning materials and practice exercises.
What we have learnt
- Inversion of Control (IoC) delegates control of object creation and lifecycle to a container or framework.
- Dependency Injection (DI) is a pattern for implementing IoC that reduces tight coupling and enhances testability.
- DI can be implemented in various ways, including constructor, setter, and field injection, each with unique advantages.
Key Concepts
- -- Inversion of Control (IoC)
- A design principle where the control of object creation and lifecycle management is transferred to a container or framework.
- -- Dependency Injection (DI)
- A design pattern where an object receives its dependencies from an external source rather than creating them itself.
- -- Constructor Injection
- A type of DI where dependencies are provided through the class constructor.
- -- Setter Injection
- A type of DI where dependencies are provided through public setter methods.
- -- Field Injection
- A type of DI used in frameworks like Spring, where dependencies are injected directly into class fields.
- -- Autowiring
- A feature of IoC containers that automatically resolves dependencies based on type, name, or constructor.
Additional Learning Materials
Supplementary resources to enhance your learning experience.