京东自营 618 + 国补 iPhone 历史最低价
Java 如果存在注释，则返回指定类型的注释，否则返回null。
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：
执行
执行中...
x
1
2
3
//package com.nowjava;4
5
import java.lang.annotation.Annotation;6
7
/** 8
来自 nowjava.com - 时 代 Java**/9
10
public class Main {11
12
public static void main(String[] argv) throws Exception {13
14
Class clazz = String.class;15
16
Class annotationClass = String.class;17
18
System.out.println(getAnnotationInLineage(clazz, annotationClass));19
20
}21
22
23
/**24
25
* Returns an annotation for the specified type if such an annotation is present, else null. The superclasses of the26
27
* class are included in the search if the annotation is not found in the leaf class.28
29
* <p/>30
31
* This method find the same kinds of annotations that are found by {@link Class#getAnnotation(Class)} with the32
33
* exception that it includes superclasses in the search as well.34
35
*36
37
* @param <A> the annotation38
39
* @param clazz the class40
41
* @param annotationClass the class of the annotation you are looking for.42
43
* @return the annotation if present, otherwise null44
45
* @see Class#getAnnotation(Class) for more details46
47
*/48
49
public static <A extends Annotation> A getAnnotationInLineage(50
51
Class<?> clazz, Class<A> annotationClass) {52
53
54
A annotation = clazz.getAnnotation(annotationClass);55
56
if (annotation != null) {57
58
return annotation;/*时 代 J a v a 公 众 号 提 供*/59
60
}61
62
63
/**代码未完, 请加载全部代码(NowJava.com).**/执行结果：
本文系作者在时代Java发表，未经许可，不得转载。如有侵权，请联系nowjava@qq.com删除。
编辑于
关注时代Java