Meta.java

package chapter12;

import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.reflect.Method;

//An annotation type declaration
@Retention(RetentionPolicy.RUNTIME)
@interface MyAnno {

    String str();

    int val();
}

public class Meta {

    //Annotate a method
    @MyAnno(str = "Annotation Example", val = 100)
    public static void myMeth() {
        Meta ob = new Meta();
        //Obtain annotation for this method
        //and display the values of the members
        try {
            //First, get a Class Object that represents this class.
            Class<?> c = ob.getClass();
            //Now, get a method object that represents this method.
            Method m = c.getMethod("myMeth");

            //Next get the annotation for this class
            MyAnno anno = m.getAnnotation(MyAnno.class);

            //Finally display the values
            System.out.println(anno.str() + " " + anno.val());
        } catch (NoSuchMethodException exc) {
            System.out.println("Method not found");
        }

    }

    public static void main(String[] args) {
        myMeth();
    }
}