Default Values 

This example shows how to provide default values for attributes of Annotations. A simple annotation with String default attribute value is shown below,

File Name  :   com/bethecoder/tutorials/annotations/defaults/Author.java  Author  :   Sudhakar KV Email  :   [email protected]

package com.bethecoder.tutorials.annotations.defaults; /**  * Permitted types for annotation attributes  *   * 1. primitive type  * 2. String  * 3. Class  * 4. annotation   * 5. enumeration   * 6. 1-dimensional arrays  */ public @interface Author {   String name() default "admin";   String creationDate(); }

We can see that the name attribute is not provided for class level annotation. Here name attribute is optional. Its usage is shown below,

File Name  :   com/bethecoder/tutorials/annotations/defaults/Source.java  Author  :   Sudhakar KV Email  :   [email protected]

package com.bethecoder.tutorials.annotations.defaults; @Author(creationDate="01/01/2500") public class Source {   @Author(name="Author2", creationDate="02/01/2500")   private int fieldOne;      private String fieldTwo;      @Author(creationDate="03/01/2500")   public Source(int fieldOne, String fieldTwo) {     super();     this.fieldOne = fieldOne;     this.fieldTwo = fieldTwo;   }   @Author(name="Author4", creationDate="04/01/2500")   public int getFieldOne() {     return fieldOne;   }      public void setFieldOne(int fieldOne) {     this.fieldOne = fieldOne;   }      public String getFieldTwo() {     return fieldTwo;   }      public void setFieldTwo(String fieldTwo) {     this.fieldTwo = fieldTwo;   }    }