How to enable Actuator in Spring boot application? What is Spring Actuator? What are its advantages? What is the use of Profiles in spring boot? What is the difference between RequestMapping and GetMapping? Describe the flow of HTTPS requests through the Spring Boot application? What is the difference between and in Spring Boot? How to disable a specific auto-configuration class? Can we disable the default web server in the Spring boot application? Can we override or replace the Embedded tomcat server in Spring Boot? ![]() ![]() What is the default port of tomcat in spring boot? Is it possible to change the port of the embedded Tomcat server in Spring Boot? Can we create a non-web application in Spring Boot? What is Spring Boot dependency management? What Are the Basic Annotations that Spring Boot Offers? What are the most common Spring Boot CLI commands? What is Spring Boot CLI and what are its benefits? How does a spring boot application get started? What is the purpose of using in the class files? What is the starter dependency of the Spring boot module? What are the advantages of using Spring Boot? Sadly, there is no marker that distinguishes this kind of annotation from other kinds like that do different things.Spring Boot Interview Questions For Freshers Many of the other answers to this question assume the user is asking about user defined annotations specifically, which are one kind of annotation that defines a set of integers or strings or other data, static to the class or method or variable they are attached to, that can be queried at compile time or run time. Therefore I would recommend studying the behavior of every different kind of annotation individually, and do not expect understanding one kind of annotation to tell you anything about the others. In other words, annotations as a concept do not exist. And that's why it is hard to understand, in general what an annotation is: because there is no common feature linking all annotations that could be used to put them in a conceptual group. These have nothing to do with one another except for starting with an symbol.īasically, what appears to have happened is that some committee responsible for maintaining the java language definition is gatekeeping the addition of new keywords to the java language, and therefore other developers are doing an end run around that by calling new keywords "annotations". There is the annotation, which is used to specify what kinds of objects a user defined annotation (a third type of construct with nothing in common with other kinds of annotation) can be attached to. There is, in other words, nothing that binds them together into an abstract conceptual group other than the fact that they all start with an symbol.įor example, there is the annotation, which tells the compiler to check that this member function overrides one in the parent class. The first thing a newcomer to annotations will ask about annotations is: "What is an annotation?" It turns out that there is no answer to this question, in the sense that there is no common behavior which is present in all of the various kinds of java annotations. Also, they only work on class level, not on method level. NET coding guidelines say not to use tag interfaces. EDIT: Attributes on classes are comparable to tag interfaces (like Serializable in Java). They also control how the IDE form designer works. NET this is used by the compiler to generate (de)serialization information for classes, determine the memory layout of structures and declare function imports from legacy libraries (among others). ![]() I don't know any examples in Java but in. ![]() When you reflect a type of a class in your code, you can access the attributes and act according to the information found there. Similarly, methods can be marked obsolete. One typical Java example, has no effect on the code but it can be used by the compiler to generate a warning (or error) if the decorated method doesn't actually override another method. No, but VB and C# have attributes which are the same thing. Also, are they unique to Java, is there a C++ equivalent?
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