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Java reflection get all annotations


The java.lang.Class provides the methods to examine the runtime properties of the object including its members and type information. For every type of object, the JVM instantiates an immutable instance of java.lang.Class. Using reflection, we can get the metadata of a class at run time.

The getAnnotations() method is used to get the all annotations for the specified element.

Example

Shape.java

package com.codesjava;
 
public interface Shape {
	public void drawShape(String color);
}

Rectangle.java

package com.codesjava;
 
@Deprecated
public class Rectangle implements Shape{
	private int defaultLength = 10;
	private int defaultWidth = 5;
 
	@Override
	public void drawShape(String color) {
		System.out.println("Rectangle create with following properties: ");
		System.out.println("Length: " + defaultLength);
		System.out.println("Width: " + defaultWidth);
	}
 
}

ReflectionTest.java

package com.codesjava;
 
import java.util.Arrays;
 
public class ReflectionTest {
	public static void main(String args[]){
		try {
			Class c=Class.forName("com.codesjava.Rectangle");  
			System.out.println(Arrays.toString(c.getAnnotations()));
		} catch (Exception e) {
			e.printStackTrace();
		}  
	}
}

Output

[@java.lang.Deprecated()]


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