Java Class getDeclaredAnnotations() Method

The getDeclaredAnnotations() method of java Class class returns annotations that are directly present on this element and ignore inherited annotations. If no annotation is set, then it returns 0.

Syntax

Parameter

Returns

All the annotations present on this element.

Throws

Example 1

//import statements
import java.lang.annotation.Retention;   //import  retention
import java.lang.annotation.RetentionPolicy;  //import  retention policy
import java.lang.reflect.Method; 
import java.lang.annotation.Annotation;  //import  annotation
  
// create custom annotation having two values 
@Retention(RetentionPolicy.RUNTIME) 
@interface SelfCreatedAnnotationinterface { 
    public String key();  //method
    public String value(); 
} 
  
// Another class on which we want to apply an annotation 
class DemoClass { 
    private String field; 
  
    @SelfCreatedAnnotationinterface(key = "getFieldvalue", 
                           value = "getting field attribute") 
    public String 
    getFieldvalue() 
    { 
        return field; 
    } 
} 
  
public class ClassgetDeclaredAnnotationsExample1 { 
    public static void main(String[] args) 
    { 
  
        Method[] mthd = DemoClass.class.getMethods(); 
  
        Annotation[] ann = mthd[0].getDeclaredAnnotations(); 
  
        for (Annotation an : ann) { 
  
            SelfCreatedAnnotationinterface selfann = (SelfCreatedAnnotationinterface)an; 
           
            System.out.println("key: " + selfann.key()); 
            System.out.println("value: " + selfann.value()); 
        } 
    } 
}

Test it Now

Output:

key: getFieldvalue
value: getting field attribute

Example 2

//import statements
import java.lang.annotation.Retention;   //import  retention
import java.lang.annotation.RetentionPolicy;  //import  retention policy
import java.lang.reflect.Method; 
import java.lang.annotation.Annotation;  //import  annotation

// declare a new annotation
@Retention(RetentionPolicy.RUNTIME)
@interface Demointerface {
   String str();
   int val();
}

public class ClassgetDeclaredAnnotationsExample2  { 

   // set values for the annotation
   @Demointerface(str = "Demo Annotation", val = 100)
   // a method to call in the main
   public static void sample() {
      ClassgetDeclaredAnnotationsExample2 obj = new  ClassgetDeclaredAnnotationsExample2();

      try {
         Class cls = obj.getClass();

         Method mthd = cls.getMethod("sample");

         Annotation[] ann = mthd.getDeclaredAnnotations();

         // print the annotation
         for (int i = 0; i < ann.length; i++) { //loop from I to length
            System.out.println(ann[i]); //print statement
         }
      } catch (NoSuchMethodException exc) {
         exc.printStackTrace();  // pritnt the stack trace for object
      }
   }
   public static void main(String args[]) {
     sample();
   }
}

Test it Now

Output:

@Demointerface(str=Demo Annotation, val=100)

Java Class getDeclaredAnnotations() Method

The getDeclaredClasses() method of java Class class returns an array of the class object representing all the classes and interface declared in this class object. If no annotations are declared, then it returns an array of length 0.

Syntax

Parameter

Returns

An array of class object.

Throws

No exception is thrown.

Example 1

import java.lang.*;
public class ClassgetDeclaredclassesExample1 {
   public static void main(String[] args) {
      try {
         Class clsnm = Class.forName("ClassgetDeclaredclassesExample1");

         Class[] classespresent = clsnm.getDeclaredClasses();
         for (int i = 0; i < classespresent.length; i++) {
            System.out.println("Class   " + (i+1)+ " =  "+ classespresent[i].getName());
         }
      } catch (ClassNotFoundException e) {
         System.out.println(e.toString());
      }
   }

   public class InClass1 {
      public InClass1() {
         System.out.println("Inner InClass1");
      }
   }

   public class InClass2 {
      public InClass2() {
         System.out.println("Inner InClass2");
      }
   }

   private class InPrvtClass {
      public InPrvtClass() {
         System.out.println("Inner Private Class3");
      }
   }
} 

Test it Now

Output:

Class   1 =  ClassgetDeclaredclassesExample1$InPrvtClass
Class   2 =  ClassgetDeclaredclassesExample1$InClass2
Class   3 =  ClassgetDeclaredclassesExample1$InClass1

Example 2

public class ClassgetDeclaredclassesExample2 {
  public static void main(String[] args) throws Exception {
    Class clsnm = Class.forName("AnotherClass");

    Class[] classestot = clsnm.getDeclaredClasses();
    for (int i = 0; i < classestot.length; i++) {
      System.out.println("Class  " + (i+1)+ "  =   "+ classestot[i].getName());
    }
  }
}

class AnotherClass {
  public class InrClass1 {
    public InrClass1() {
      System.out.println("Inside Inner Class1");
    }
  }

  public class InrClass2 {
    public InrClass2() {
      System.out.println("Inside Inner Class2");
    }
  }

  private class InnerPrivateClass {
    public InnerPrivateClass() {
      System.out.println("Inner Private Class");
    }
  }
}

Test it Now

Output:

Class  1  =   AnotherClass$InnerPrivateClass
Class  2  =   AnotherClass$InrClass2
Class  3  =   AnotherClass$InrClass1

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