Reveal the technical principles of the "Ickenham 'framework in the java class library

Reveal the technical principles of the "Ickenham 'framework in the java class library In the field of Java development, there are many types of libraries and frameworks for developers to simplify the maintenance and scalability of code to simplify the development process and improve the code of code.Among them, 'Ickenham' is a highly concerned framework that focuses on simplifying the dependent injection and control reversal of the simplified Java application. Relying on injection and control reversal is one of the design models commonly used in modern software development.The goal of this mode is to decouple the component of the application, so that they can work more flexibly.The 'Ickenham' framework was created to achieve this goal. The core principle of 'Ickenham' is to mark the dependencies between the use of annotations in the Java class.Developers can use these annotations to inform when the framework should create objects and inject them into other objects. First, let's see a simple example to show how to use the 'Ickenham' framework for dependencies.Suppose we have a class named `userService`, which depends on the` UserRePOSITORY` class to obtain user information from the database.We can use the constructor of `@inject` in the constructor of the` userService` class. public class UserService { private UserRepository userRepository; @Inject public UserService(UserRepository userRepository) { this.userRepository = userRepository; } // Business logic code } Next, we need to tell how the 'Ickenham' framework creates an object and injects the `UserRepository" dependencies.To this end, we need to create a configuration class and use the `@beans` annotation to mark the object we want to create and manage: @Configuration public class AppConfig { @Beans public UserRepository userRepository() { return new UserRepositoryImpl(); } @Beans public UserService userService() { return new UserService(userRepository()); } } This is a simple configuration class example, which defines the creation and dependence of `userRePOSITOSITOSITOSITORY` and` Userservice`.The framework will automatically instantiated and injected dependencies based on the annotation information in the configuration class, so that we can directly use the `userService` object elsewhere, without the need to manually create it. Finally, we need to initialize the 'Ickenham' framework in the inlet file of the application and load the configuration class: public class MainApp { public static void main(String[] args) { Injector.initialize(new AppConfig()); // At this time, we can directly use the UserService object UserService userService = Injector.getBean(UserService.class); // Business logic code } } By calling the method of `injector.getBean (), we can obtain instantiated and inject good dependencies from the framework, so that it can be used directly. The above is the basic principle and example of the 'Ickenham' framework.By using this framework, we can easily achieve dependency injection and control reversal, and improve the modularity and testability of code.Of course, the specific technical principles are far more than that. Developers can understand their internal realization and higher levels of use through the source code of the reading framework. Summarize: -'Ickenham' is a Java framework that focuses on simplifying dependency injection and control reversal. -In the use of annotations in the Java class to mark the dependencies and management objects. -Che use the configuration class to define the creation and dependence of the object. -The initialization framework in the application entry file and obtain an instantiated and injecting good dependencies through the method of `Injector.getBean ()`. In fact, the technical principle of the Ickenham framework is much more complicated than the above simple examples. Therefore, developers should read the framework document and source code in detail in order to better understand and use the framework.