ImplementsAnnotation.qhelp

<!DOCTYPE qhelp PUBLIC
  "-//Semmle//qhelp//EN"
  "qhelp.dtd">
<qhelp>


<overview>
<p>Although an annotation type is a special kind of interface that
can be implemented by a concrete class, this is not its intended use.
It is more likely that an annotation type should be used to annotate a class.
</p>

</overview>
<recommendation>

<p>Ensure that any annotations are used to annotate a class, unless they are really supposed to be 
extended or implemented by the class.
</p>

</recommendation>
<example>

<p>In the following example, the annotation <code>Deprecated</code> is implemented by the class
<code>ImplementsAnnotation</code>.</p>

<sample src="ImplementsAnnotation.java" />

<p>The following example shows the intended use of annotations: to annotate the class
<code>ImplementsAnnotationFix</code>.</p>

<sample src="ImplementsAnnotationGood.java" />

</example>
<references>


<li>
  Java Language Specification:
  <a href="https://docs.oracle.com/javase/specs/jls/se11/html/jls-9.html#jls-9.6">Annotation Types</a>.
</li>
<li>
  The Java Tutorials:
  <a href="https://docs.oracle.com/javase/tutorial/java/annotations/index.html">Annotations</a>.
</li>
<li>
Help - Eclipse Platform:
<a href="https://help.eclipse.org/2020-12/advanced/content.jsp?topic=/org.eclipse.jdt.doc.user/reference/preferences/java/compiler/ref-preferences-errors-warnings.htm">Java Compiler Errors/Warnings Preferences</a>.
</li>


</references>
</qhelp>