Still typing code mechanically? When many of our developers are developing Spring programs, in many cases, they passively accept the Spring feature cases that our predecessors have done for us. In this way, it does reduce the cost of our development to a large extent, but at the same time we lose an excellent learning opportunity, thus limiting the horizontal expansion ability of our developers.
You only know how to use it, but you don’t know what you’re doing, then you are destined to be a programmer. The Spring framework integrates almost half of the Java web development, but you only know how to write it, but you don't know why you want to write it like this, or how to optimize it.
As a lightweight Java development framework, Spring integrates interface-oriented programming ideas throughout the entire Java system application, so it is often mentioned in Java interviews. This article talks about the important knowledge points in the Spring framework through some questions in the Spring interview!
Spring advanced interview topics
One, Spring related concepts combing the interview question set
Two, application scenario interview question set
Third, the underlying implementation principle explains the interview question set in detail
Four, Spring Boot interview question set
Interview Question Answer
1. Talk about the understanding of Spring IoC?
IoC Inverse of Control The concept of inverse control. The operation of manually creating objects in the previous program was handed over to the Spring framework to implement, and the operation of creating objects was reversed to the Spring framework. The life cycle of an object is managed by Spring, and an object is obtained directly from Spring.
2. Talk about your understanding of Spring DI?
DI Dependency Injection Dependency Injection. When the Spring framework creates Bean objects, it dynamically injects dependent objects into the Bean component to achieve the injection of dependent objects.
3. What is the difference between the BeanFactory interface and the ApplicationContext interface?
1. The ApplicationContext interface inherits the BeanFactory interface. The core Spring factory is the BeanFactory. The BeanFactory adopts lazy loading. The Bean will be initialized only when the first getBean is obtained. The ApplicationContext will initialize the Bean when the configuration file is loaded. 2. ApplicationContext is an extension of BeanFactory, which can carry out internationalization processing, event delivery, Bean automatic assembly, and various application layer Context implementations. Basically, ApplicationContext is used in development, Web ApplicationContext is used in Web projects, and BeanFactory is rarely used.
4. Please introduce the core classes of Spring that you are familiar with, and explain what they do?
1. BeanFactory: Generate a new instance, which can realize the singleton mode . 2. BeanWrapper: Provide unified get and set methods . 3. ApplicationContext: Provide the implementation of the framework, including all the functions of BeanFactory.
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The editor has compiled some books and documents on performance optimization and technical learning , I hope it will be helpful to everyone
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