In this video of code decode we have covered Java Developer Interview Questions and Answers for 6 years of Experienced candidate
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*Question - **What is an IOC Container? How Does it Work**?*
An IoC Container is a software framework component that manages the objects (beans) in your application. It takes over the responsibility of creating, configuring, and assembling these objects and their dependencies.
- *Object Creation:* Traditionally, you’d manually create objects in your code. With an IoC container, you define the objects (beans) you need in your application using configuration files (XML or annotations) or Java classes. The container then takes care of instantiating these objects.
- *Dependency Injection:* Objects often rely on other objects to function properly (dependencies). Instead of manually creating and passing these dependencies around, you declare them in your object definitions. The IoC container injects (provides) the required dependencies to the objects it creates. This creates a loose coupling between objects, making your code more modular and easier to test.
- *Object Lifecycle Management:* The IoC container also manages the lifecycle of objects, including initialization and destruction. This frees you from writing boilerplate code for these tasks.
What is Dependency Injection?
In software development, dependency injection (DI) is a technique for providing an object with the objects (dependencies) it needs to function. Here’s a breakdown of the key concepts:
*What are Dependencies?*
- Dependencies are other objects that a class or function relies on to perform its work effectively.
- Examples:
- A car depends on an engine, wheels, and other parts to function.
- A database access class depends on a database connection object to interact with the database.
What is Application Context & its use?
In Spring Boot applications, the ApplicationContext is a central interface that plays a critical role in managing the objects (beans) used throughout your application. It’s essentially a container that provides the following functionalities:
*1. Bean Management:*
- The core responsibility of the ApplicationContext is to manage the objects (beans) that make up your application.
- These beans are typically defined using annotations or XML configuration files.
- The ApplicationContext takes care of creating, configuring, and assembling these beans according to the specified configuration.
*2. Dependency Injection:*
- Beans often rely on other beans to function properly. These are called dependencies.
- The ApplicationContext facilitates dependency injection by automatically providing the required dependencies to the beans it creates. This eliminates the need for manual dependency creation and management, leading to loosely coupled and more maintainable code.
*3. Resource Access:*
- The ApplicationContext provides access to various resources your application might need, such as property files, configuration files, and message bundles.
- This simplifies resource retrieval and ensures consistent access throughout your code.
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