Java by API/java.lang.annotation/Annotation

java.lang.annotation.Annotation

 
import java.lang.annotation.Annotation;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.reflect.Method;
@Retention(RetentionPolicy.RUNTIME)
@interface MyAnno {
  String str();
  int val();
}
@Retention(RetentionPolicy.RUNTIME)
@interface What {
  String description();
}
@What(description = "An annotation test class")
@MyAnno(str = "MyClass", val = 99)
class MyClass {
  @What(description = "An annotation test method")
  @MyAnno(str = "Testing", val = 100)
  public static void myMeth() {
    MyClass ob = new MyClass();
    try {
      Annotation annos[] = ob.getClass().getAnnotations();
      for (Annotation a : annos)
        System.out.println(a);
      Method m = ob.getClass().getMethod("myMeth");
      annos = m.getAnnotations();
      for (Annotation a : annos)
        System.out.println(a);
    } catch (NoSuchMethodException exc) {
      System.out.println("Method Not Found.");
    }
  }
  public static void main(String args[]) {
    myMeth();
  }
}