Constructor getDeclaredAnnotations() method in Java with Examples

The getDeclaredAnnotations() method of java.lang.reflect.Constructor class is used to return annotations present on this Constructor element as an array of Annotation class objects. The getDeclaredAnnotations() method ignores inherited annotations on this constructor object.Returned array can contains no annottaions means length of that array can be 0 if the constructor has nop annotations.

Syntax:

public Annotation[] getDeclaredAnnotations()

Parameters: This method accepts nothing.

Return: This method returns array of annotations directly present on this element

Below programs illustrate getDeclaredAnnotations() method:
Program 1:

// Java program to illustrate 
// getDeclaredAnnotations() method 
  
import java.lang.annotation.Annotation; 
import java.lang.reflect.Constructor; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
        // create a class object 
        Class classObj = shape.class; 
  
        // get Constructor object 
        // array from class object 
        Constructor[] cons 
            = classObj.getConstructors(); 
  
        // get array of annotations 
        Annotation[] annotations 
            = cons[0].getDeclaredAnnotations(); 
  
        // print length of annotations array 
        System.out.println("Annotation : "
                           + annotations); 
    } 
  
    @CustomAnnotation(createValues = "GFG") 
    public class shape { 
  
        @CustomAnnotation(createValues = "GFG") 
        public shape() 
        { 
        } 
    } 
  
    // create a custom annotation 
    public @interface CustomAnnotation { 
        public String createValues(); 
    } 
    } 

Output:

Annotation : [Ljava.lang.annotation.Annotation;@4aa298b7

Program 2:

// Java program to illustrate 
// getDeclaredAnnotations() method 
  
import java.lang.annotation.Annotation; 
import java.lang.reflect.Constructor; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
        // create a class object 
        Class classObj = String.class; 
  
        // get Constructor object 
        // array from class object 
        Constructor[] cons 
            = classObj.getConstructors(); 
  
        // get array of annotations 
        Annotation[] annotations 
            = cons[0].getDeclaredAnnotations(); 
  
        // print length of annotations array 
        System.out.println("Annotation length : "
                           + annotations.length); 
    } 
} 

Output:

Annotation length : 0

References: https://docs.oracle.com/javase/10/docs/api/java/lang/reflect/Constructor.html#getDeclaredAnnotations()

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