Therefore, the final keyword forms a part in providing meta-data information in the class definition. So, the introduction of the final keyword adds some additional information (or adds some constraints) over the class definition telling that no other class in the word can extend the Employee class. It can be noted that the class declaration is preceded with the final keyword which tells that this class cannot be sub-classed. The above is a definition of a class, Employee. Getters and setters for Employee class. The added Annotation to Java Elements have proven themselves to be considerably useful in many instances. It can be seen in class declaration, method declaration, field declaration etc. Annotations in Java can be seen elsewhere in a program. This feature was added to Java 5.0 as a result of the JSR 175 namely “A Metadata Facility for the JavaTM Programming Language”. Java, being a wonderful object-oriented language provided support for Annotations starting from 5.0. The topics covered in this article are as follows, This article provides you a complete guide detailing the various aspects of Annotations.
Annotations in java code#
For example, they can ensure the consistency between classes, can check the validity of the paramters passed by the clients at run-time and can generate lot of base code for a project. Tools which will read and interpret the Annotations will implement a lot of functionalities from the meta-information obtained. Like Classes, Interfaces or Enums, Annotations define a type in Java and they can be applied to several Java Elements. Annotations in Java is all about adding meta-data facility to the Java Elements.
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