Aquileo | Package getDeclaredAnnotations() method in Java with Examples

The getDeclaredAnnotations() method of java.lang.Package class is used to get the declared annotations present in this class. The method returns an array of declared annotations present. Syntax:

public DeclaredAnnotation[] getDeclaredAnnotations()

Parameter: This method does not accepts any parameter. Return Value: This method returns an array of declared annotations present. Below programs demonstrate the getDeclaredAnnotations() method. Example 1:

Java

// 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);
        }
    }
}

Output:

Class represented by myClass: class Test
DeclaredAnnotation of myClass: [@java.lang.Deprecated()]

Example 2:

Java

// 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()));
    }
}

Output:

Class represented by myClass: class Test DeclaredAnnotation of myClass: [@DeclaredAnnotation(key=GFG, value=GeeksForGeeks)]

Reference: https://docs.oracle.com/javase/9/docs/api/java/lang/Package.html#getDeclaredAnnotations--

Package getDeclaredAnnotations() method in Java with Examples

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