The getDeclaredAnnotation() method of java.lang.Package class is used to get the declared annotation of the specified declared annotation type, if such an declared annotation is present in this class. The method returns that class in the form of an object.
Syntax:
public T getDeclaredAnnotation(Class<T> declared annotationClass)
Parameter: This method accepts a parameter declared annotationClass which is the type of the declared annotation to get.
Return Value: This method returns the specified object of the declared annotation class.
Exception: This method throws:
- NullPointerException: if the given declared annotation class is null.
Below programs demonstrate the getDeclaredAnnotation() method.
Example 1:
// Java program to demonstrate// getDeclaredAnnotation() 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 getDeclaredAnnotation() method        System.out.println(            "DeclaredAnnotation of myClass: "            + myClass                  .getDeclaredAnnotation(                      DeclaredAnnotation.class));    }} |
Output:
Class represented by myClass: class Test
DeclaredAnnotation of myClass: @DeclaredAnnotation(key=GFG, value=GeeksForGeeks)
Example 2:
// Java program to demonstrate// getDeclaredAnnotation() method  import java.util.*;import java.lang.annotation.*;  @Deprecatedpublic 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 getDeclaredAnnotation() method            System.out.println(                "DeclaredAnnotation of myClass: "                + myClass                      .getDeclaredAnnotation(                          Deprecated.class));        }        catch (Exception e) {            System.out.println(e);        }    }} |
Output:
Class represented by myClass: class Test
DeclaredAnnotation of myClass: @java.lang.Deprecated()
