用示例注释 Java 中的 getAnnotations()方法
原文:https://www . geeksforgeeks . org/annatedelement-getannotations-method-in-Java-with-examples/
Java . lang . annotatedeleement 类的 getAnnotations() 方法用于获取实现该接口的类中存在的注释。方法返回存在的注释数组。
语法:
public Annotation[] getAnnotations()
参数:该方法不接受任何参数。
返回值:该方法返回一组存在的注释。
下面的程序演示了 getAnnotations()方法。
例 1:
// Java program to demonstrate
// getAnnotations() method
import java.lang.reflect.*;
import java.util.*;
import java.lang.annotation.*;
@Deprecated
public class Test {
public Object obj;
public static void main(String[] args)
throws ClassNotFoundException
{
try {
// returns the Class object
// for this myAnnotatedElement
AnnotatedElement myAnnotatedElement
= Test.class;
System.out.println(
"AnnotatedElement represented"
+ " by myAnnotatedElement: "
+ myAnnotatedElement.toString());
// Get the annotation
// using getAnnotations() method
System.out.println(
"Annotation of myAnnotatedElement: "
+ Arrays.toString(
myAnnotatedElement
.getAnnotations()));
}
catch (Exception e) {
System.out.println(e);
}
}
}
Output:
由 my annotationdelete:class Test 表示的批注 my annotationdelete:[@ Java . lang .弃用()]的 批注
例 2:
// Java program to demonstrate
// getAnnotations() method
import java.lang.reflect.*;
import java.util.*;
import java.lang.annotation.*;
// create a custom Annotation
@Retention(RetentionPolicy.RUNTIME)
@interface Annotation {
// This annotation has two attributes.
public String key();
public String value();
}
// call Annotation for method
// and pass values for annotation
@Annotation(key = "GFG", value = "GeeksForGeeks")
public class Test {
public Object obj;
public static void main(String[] args)
throws ClassNotFoundException
{
// returns the Class object
// for this myAnnotatedElement
AnnotatedElement myAnnotatedElement
= Test.class;
System.out.println(
"AnnotatedElement represented"
+ " by myAnnotatedElement: "
+ myAnnotatedElement.toString());
// Get the annotation
// using getAnnotations() method
System.out.println(
"Annotation of myAnnotatedElement: "
+ Arrays.toString(
myAnnotatedElement
.getAnnotations()));
}
}
Output:
用 my annotationdelete 表示的注解:类测试 my annotationdelete 的注解:[@Annotation(键=GFG，值=GeeksForGeeks)]
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