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Java 如果存在注释，则返回指定类型的注释，否则返回null。

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如果存在注释，则返回指定类型的注释，否则返回null。

实例源码：

源代码：

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//package com.nowjava;

import java.lang.annotation.Annotation;

/** 
 来自 nowjava.com - 时  代  Java**/

public class Main {

public static void main(String[] argv) throws Exception {

Class clazz = String.class;

Class annotationClass = String.class;

System.out.println(getAnnotationInLineage(clazz, annotationClass));

}

/**

* Returns an annotation for the specified type if such an annotation is present, else null. The superclasses of the

* class are included in the search if the annotation is not found in the leaf class.

* <p/>

* This method find the same kinds of annotations that are found by {@link Class#getAnnotation(Class)} with the

* exception that it includes superclasses in the search as well.

* @param <A>             the annotation

* @param clazz           the class

* @param annotationClass the class of the annotation you are looking for.

* @return the annotation if present, otherwise null

* @see Class#getAnnotation(Class) for more details

public static <A extends Annotation> A getAnnotationInLineage(

Class<?> clazz, Class<A> annotationClass) {

A annotation = clazz.getAnnotation(annotationClass);

if (annotation != null) {

return annotation;/*时 代 J a v a 公 众 号 提 供*/

}

/**代码未完, 请加载全部代码(NowJava.com).**/

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编辑于 2020-03-26 09:23:272020-03-26 09:23:27

实例源码

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