java.lang.annotation.Annotation : Annotation « java.lang.annotation « Java by API

1. Java by API
2. java.lang.annotation
3. 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();
  }
}

   
  

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