Get annotation by Annotation class in Java

Description

The following code shows how to get annotation by Annotation class.

Example


/*  w  w w  . java 2s. com*/
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.reflect.Method;

@Retention(RetentionPolicy.RUNTIME)
@interface MySingle {
  int value(); // this variable name must be value
}

public class Main {
  @MySingle(100)
  public static void myMeth() {
    Main ob = new Main();

    try {
      Method m = ob.getClass().getMethod("myMeth");

      MySingle anno = m.getAnnotation(MySingle.class);

      System.out.println(anno.value()); // displays 100

    } catch (NoSuchMethodException exc) {
      System.out.println("Method Not Found.");
    }
  }

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

The code above generates the following result.





















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