Returns true if the supplied annotation is present on the target class or any of its super classes. - Java java.lang.annotation

Description

Returns true if the supplied annotation is present on the target class or any of its super classes.

Demo Code

//package com.java2s;
import java.lang.annotation.Annotation;

public class Main {
    public static void main(String[] argv) throws Exception {
        Class target = String.class;
        Class annotation = String.class;
        System.out.println(isAnnotationPresent(target, annotation));
    }/*from  w  w  w. j  a v a 2  s  .  com*/

    /**
     * Returns true if the supplied annotation is present on the target class
     * or any of its super classes.
     * 
     * @param annotation Annotation to find.
     * 
     * @return true if the supplied annotation is present on the target class
     * or any of its super classes.
     **/
    public static boolean isAnnotationPresent(Class<?> target,
            Class<? extends Annotation> annotation) {
        Class<?> clazz = target;
        if (clazz.isAnnotationPresent(annotation)) {
            return true;
        }
        while ((clazz = clazz.getSuperclass()) != null) {
            if (clazz.isAnnotationPresent(annotation)) {
                return true;
            }
        }
        return false;
    }
}

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Related Tutorials

• filter annotations by given class.
• Find a single java.lang.annotation.Annotation of annotation Type from the supplied Class , traversing its interfaces and superclasses if no annotation can be found on the given class itself.
• Returns true if any of the supplied annotations is present on the target class or any of its super classes.
• Returns true if any annotation in parameter Annotations matches annotation Class.
• Returns the annotation of the annotationClass of the clazz or any of it super classes.