Java Reflection for Annotations

Create Entity Class

Create entities package and create new class named Student as below:

package entities;

import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name = "student")
public class Student {

	private String id;
	private String name;
	private int age;

	@XmlElement(name = "id")
	public String getId() {
		return id;
	}

	public void setId(String id) {
		this.id = id;
	}

	@XmlElement(name = "name")
	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	@XmlElement(name = "age")
	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}

	@Deprecated
	public void say() {
		System.out.println("Hello World");
	}

}

Run Application

package reflection;

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import entities.Student;

public class Main {

	private static void displayAllAnnotations(Student student) {
		Class studentClass = student.getClass();
		for (Method method : studentClass.getDeclaredMethods()) {
			System.out.println("Method Name: " + method.getName());
			Annotation[] annotations = method.getAnnotations();
			System.out.println("Count Annotations: " + annotations.length);
			if (annotations.length > 0) {
				for (Annotation annotation : annotations) {
					System.out.println("\tAnnotation Name: " + annotation.annotationType().getName());
					System.out.println("\tAnnotation Simple Name: " + annotation.annotationType().getSimpleName());
					System.out.println("\tAnnotation Modifier: " + Modifier.toString(annotation.annotationType().getModifiers()));
				}
			}
			System.out.println("========================================================================");
		}
	}

	public static void main(String[] args) {

		Student student = new Student();
		displayAllAnnotations(student);

	}

}

Output

Method Name: getName
Count Annotations: 1
	Annotation Name: javax.xml.bind.annotation.XmlElement
	Annotation Simple Name: XmlElement
	Annotation Modifier: public abstract interface
========================================================================
Method Name: getId
Count Annotations: 1
	Annotation Name: javax.xml.bind.annotation.XmlElement
	Annotation Simple Name: XmlElement
	Annotation Modifier: public abstract interface
========================================================================
Method Name: setName
Count Annotations: 0
========================================================================
Method Name: setId
Count Annotations: 0
========================================================================
Method Name: getAge
Count Annotations: 1
	Annotation Name: javax.xml.bind.annotation.XmlElement
	Annotation Simple Name: XmlElement
	Annotation Modifier: public abstract interface
========================================================================
Method Name: say
Count Annotations: 1
	Annotation Name: java.lang.Deprecated
	Annotation Simple Name: Deprecated
	Annotation Modifier: public abstract interface
========================================================================
Method Name: setAge
Count Annotations: 0
========================================================================