Java Class getAnnotationsByType() Method

The getAnnotationsByType() method of java Class class gets the annotation by type that is associated with this element. If no annotation is related to this element, it returns an array of length 0.

Syntax

public <A extends Annotation> A[] getAnnotationsByType(Class<A> annotationClass)

Parameter

annotationClass - the Class object corresponding to the annotation type

Returns

Associated annotation type associated with this element, otherwise an array of length zero.

Throws

NullPointerException

Example 1

import java.util.Arrays;
public class ClassgetAnnotationsByteExample1 {
    public static void main(String... args) {
        Deprecated[] byteType = Classsub.class
                .getAnnotationsByType(Deprecated.class);
        System.out.println("    "  +Arrays.asList(byteType)); //print array byteType.
    }

    @Deprecated
    private static class Classsub {
    }
}}

Test it Now

Output:

[@java.lang.Deprecated()]

Example 2

 //import statements
import java.lang.annotation.Inherited;  //import inherited
import java.lang.annotation.Retention;   //import  retention
import java.lang.annotation.RetentionPolicy;   //import  retention policy
import java.util.Arrays;  
public class ClassgetAnnotationsByteExample2 {

    public static void main(String... args) {
        Class1 obj = new Class1();
        Deprecated[] dep = Class1.class.getAnnotationsByType(Deprecated.class);
        System.out.println("  "   +Arrays.toString(dep));

        Annotation1[] ann = Class1.class.getAnnotationsByType(Annotation1.class);
        System.out.println("  "   +Arrays.toString(ann));
    }

    @Deprecated
    public static class Class1 extends SuperClass1 {
        Class1()
        {
            System.out.println("subClass Constructor Executing...");
        }
    }

    @Annotation1
    public static class SuperClass1 {
        SuperClass1()
        {
            System.out.println("MySuperClass Constructor Executing...");
        }
    }

    @Retention(RetentionPolicy.RUNTIME)
    @Inherited
    private static @interface Annotation1 {
    }
}

Test it Now

Output:

MySuperClass Constructor Executing...
subClass Constructor Executing...
[@java.lang.Deprecated()]
[@ClassgetAnnotationsByteExample2$Annotation1()]

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