java #annotations

Posted 2021-05-08

import java.lang.annotation.*;

public class TestClass {
	@About
	public void mtd () throws NoSuchMethodException {
		
		Class cl = TestClass.class;
		Annotation an = cl.getMethod("mtd", null).getAnnotation(About.class);
		System.out.println(cl.getMethod("mtd", null).getName());
		System.out.println(cl.getMethod("mtd", null).getReturnType());
		About ab= (About) an;
		System.out.println(ab.info());
	}
}

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@interface About {
	String info() default "default string";
	
	
}