Java annotations are used to provide meta data for your Annotation article code.
Being meta data, Java annotations do not directly affect the execution of your code, although some types of annotations can actually be used for that purpose. Java annotations were added to Java from Java 5. This text covers Java annotations as they look in Java 8, Java 9 and beyond. As far as I know, Java annotations have not changed in later Java version, so this text should be valid for Java 8, 9, 10 and 11 programmers too. Java has 3 built-in annotations that you can use to give instructions to the Java compiler. These annotations are explained in more detail later in this text.
Java annotations can be be used at build-time, when you build your software project. Building the software is typically done by an automatic build tool like Apache Ant or Apache Maven. It is possible, however, to define your own annotations that are available at runtime. These annotations can then be accessed via Java Reflection, and used to give instructions to your program, or some third party API. In the example above the annotation name is Entity. An element is like an attribute or parameter. Elements are enclosed inside the parentheses after the annotation name.
Annotations without elements do not need the parentheses. An annotation annotation contain multiple elements. Article an annotation just contains a single element named value, you can leave out the element name, and just provide the value. In this case, the annotation name is Entity.
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The Entity annotation is an annotation I have made up. It doesn’t have any meaning in Java. Each of these annotations are explained in the following sections. Deprecated annotation is used to mark a class, method or field as deprecated, meaning it should no longer be used. If your code uses deprecated classes, methods or fields, the compiler will give you a warning. Deprecated Java annotation above the class declaration marks the class as deprecated.
Deprecated annotation above method and field declarations, to mark the method or field as deprecated. Override Java annotation is used above methods that override methods in a superclass. If the method does not match a method in the superclass, the compiler will give you an error. Override annotation is not necessary in order to override a method in a superclass. It is a good idea to use it still, though. In case someone changed the name of the overridden method in the superclass, your subclass method would no longer override it.
Override annotation you would not find out. Override annotation the compiler would tell you that the method in the subclass is not overriding any method in the superclass. For instance, if a method calls a deprecated method, or makes an insecure type cast, the compiler may generate a warning. Annotations are defined in their own file, just like a Java class or interface. I have created a video tutorial about creating your own Java Annotations, by the way.
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