The main point of this annotation is to show explicitly that this method is to be overridden, so as to avoid making a mistake in the method implementation and get weird results. 3.1 This annotation indicates that a method declaration is intended to override a method declaration in a super-class (sometimes the Object class, or another). When using an IDE these annotations are extremely useful as they provide essential information, or allow you to examine your code more closely. Java has several built-in annotations that are used as compiler instructions. The example code in this article was built and run using: How to create a custom annotation – and integrate it in an existing web application.How to create a custom annotation – and its consumer.How to use annotations from JPA, Spring frameworks and validate the results during the compile-time and runtime.How to use built-in annotations and demonstrate the difference during development cycle within Eclipse IDE.It can be done by an IDE, Java compiler annotation processor, or frameworks. Apply – Applies annotation on the elements.There are three steps required for a Java annotation to work: – indicates an annotation type is automatically inherited by sub-classes.If defines as then it declared type is a meta-annotation type. – defines the ElementType that the annotation is applied to.– defines where the annotation is retained, defaults to RetentionPolicy.CLASS.Java provides four built-in annotations to define an annotation: Note: annotation member can only be primitive type, Enum, or String. Full – It is an annotation which has multiple data members as name-value pair. and Single Value – It is an annotation which has only one member and specifies the member name as the value.
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