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Java Reflection - Field.getDeclaredAnnotationsByType() Examples

Java Reflection Java Java API 

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Class:

java.lang.reflect.Field

java.lang.Objectjava.lang.Objectjava.lang.reflect.AccessibleObjectjava.lang.reflect.AccessibleObjectjava.lang.reflect.AnnotatedElementAnnotatedElementjava.lang.reflect.Fieldjava.lang.reflect.Fieldjava.lang.reflect.MemberMemberLogicBig

Method:

public <T extends Annotation> T[] getDeclaredAnnotationsByType(Class<T> annotationClass)

Returns this element's annotation(s) for the specified type if such annotations are either directly present or indirectly present.


Examples


package com.logicbig.example.field;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.lang.reflect.Field;
import java.util.Arrays;

public class GetDeclaredAnnotationsByTypeExample {

    private static class Test {
        @Deprecated
        @ReadOnly
        private String str;
    }


    public static void main(String... args) throws NoSuchFieldException {
        Field f = Test.class.getDeclaredField("str");
        ReadOnly[] a = f.getDeclaredAnnotationsByType(ReadOnly.class);
        System.out.println(a.length);
        Arrays.stream(a).forEach(System.out::println);
    }

    @Target({ElementType.FIELD})
    @Retention(RetentionPolicy.RUNTIME)
    private @interface ReadOnly {}

}

Output

1
@com.logicbig.example.field.GetDeclaredAnnotationsByTypeExample$ReadOnly()

See Also