Programming For Future

Self-Descriptive Coding in java. Java has introduced the feature called annotation through which elements of a program can be marked to contain some Meta data. This Meta data may be available at compile time or at running time. Now it is possible to provide some information for methods, fields, classes etc. that will be available at processing time. You can annotate your method telling to calling method how to call your method. You can annotate your class to tell something to class loader how to cerate the object of class and for what the object should be used. You can declare fields in you class those may be annotated to get their value from specified source. New version of java and j2ee has been updated to use annotations. Like EJB, webs services, JPA(java persistence API) etc. New version EJB3.x has been simplified to create the EJB without using any XML file. Because the information required to EJB container are provided by the annotation. EJB programmer annotates his class to prov