java.lang.Package类的getDeclaredAnnotations()方法用于获取此类中存在的已声明注释。该方法返回存在的已声明注释的数组。
用法:
public DeclaredAnnotation[] getDeclaredAnnotations()
参数:此方法不接受任何参数。
返回值:此方法返回存在的已声明注释的数组。
下面的程序演示了getDeclaredAnnotations()方法。
范例1:
// Java program to demonstrate
// getDeclaredAnnotations() method
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 class
Class myClass = Test.class;
System.out.println(
"Class represented by myClass:"
+ myClass.toString());
// Get the declared annotation
// using getDeclaredAnnotations() method
System.out.println(
"DeclaredAnnotation of myClass:"
+ Arrays.toString(
myClass.getDeclaredAnnotations()));
}
catch (Exception e) {
System.out.println(e);
}
}
}
输出:
Class represented by myClass:class Test DeclaredAnnotation of myClass:[@java.lang.Deprecated()]
范例2:
// Java program to demonstrate
// getDeclaredAnnotations() method
import java.util.*;
import java.lang.annotation.*;
// create a custom DeclaredAnnotation
@Retention(RetentionPolicy.RUNTIME)
@interface DeclaredAnnotation {
// This declared annotation has two attributes.
public String key();
public String value();
}
// call DeclaredAnnotation for method
// and pass values for declared annotation
@DeclaredAnnotation(key = "GFG", value = "GeeksForGeeks")
public class Test {
public Object obj;
public static void main(String[] args)
throws ClassNotFoundException
{
// returns the Class object for this class
Class myClass = Test.class;
System.out.println(
"Class represented by myClass:"
+ myClass.toString());
// Get the declared annotation
// using getDeclaredAnnotations() method
System.out.println(
"DeclaredAnnotation of myClass:"
+ Arrays.toString(
myClass.getDeclaredAnnotations()));
}
}
输出:
Class represented by myClass:class Test
DeclaredAnnotation of myClass:[@DeclaredAnnotation(key=GFG, value=GeeksForGeeks)]
参考: https://docs.oracle.com/javase/9/docs/api/java/lang/Package.html#getDeclaredAnnotations-
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注:本文由纯净天空筛选整理自guptayashgupta53大神的英文原创作品 Package getDeclaredAnnotations() method in Java with Examples。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。