How to create optional parameters for own annotations?

JavaAnnotations

Java Problem Overview

Following is the annotation code

public @interface ColumnName {
   String value();
   String datatype();
 }

I would like to make datatype an optional parameter, for example

@ColumnName(value="password")

should be a valid code.

Java Solutions

Solution 1 - Java

Seems like the first example in the official documentation says it all ...

/**
 * Describes the Request-For-Enhancement(RFE) that led
 * to the presence of the annotated API element.
 */
public @interface RequestForEnhancement {
    int    id();
    String synopsis();
    String engineer() default "[unassigned]"; 
    String date()     default "[unimplemented]"; 
}

Solution 2 - Java

To make it optional you can assign it a default value like that:

public @interface ColumnName {
   String value();
   String datatype() default "String";
 }

Then it doesn't need to be specified when using the Annotation.

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Content TypeOriginal AuthorOriginal Content on Stackoverflow
QuestionBiju CDView Question on Stackoverflow
Solution 1 - JavaRiduidelView Answer on Stackoverflow
Solution 2 - JavaJohannes WachterView Answer on Stackoverflow