original annotation sample

AnnotationSample.java

/**
 *
 * $ javac AnnotationSample.java -Xlint:unchecked
 * $ java AnnotationSample
 *
 */

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

@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE})
@interface MyTypeAnnotation {
    String value() default "MyTypeAnnotation";
}

@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD})
@interface MyMethodAnnotation {
    String value() default "MyMethodAnnotation";
}

@MyTypeAnnotation("class annotation")
public class AnnotationSample {
    @MyMethodAnnotation("method annotation")
    public static void main(String[] args) throws Throwable {
        Class<?> c = AnnotationSample.class;
        Method m = c.getMethod("main", new Class[]{String[].class});

        MyTypeAnnotation typeAnnotation = c.getAnnotation(MyTypeAnnotation.class);
        System.out.println(typeAnnotation.value());

        MyMethodAnnotation methodAnnotation = m.getAnnotation(MyMethodAnnotation.class);
        System.out.println(methodAnnotation.value());
    }
}