Java自定义Annotation,通过反射解析Annotation(2)

@Deprecated
    @MethodInfo(comment = "deprecated method", date = "2015/03/26")
    public static void oldMethod() {
        System.out.println("old method, don't use it.");
    }

@SuppressWarnings({ "unchecked", "deprecation" })
    @MethodInfo(author = "Pankaj", comment = "Main method", date = "Nov 17 2012", version = "1.0")
    public static void genericsTest() {
        oldMethod();
    }
}使用反射来解析Annotation
注意我们的Annotation的Retention Policy 必须是RUNTIME，否则我们无法在运行时从他里面获得任何数据。

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;

/**
 * Created by Administrator on 2015/3/26.
 */
public class AnnotationParsing {

public static void main(String[] args) {
        for (Method method: AnnotationExample.class.getMethods()) {
            if (method.isAnnotationPresent(MethodInfo.class)) {
                for (Annotation annotation:method.getAnnotations()) {
                    System.out.println(annotation + " in method:"+ method);
                }

MethodInfo methodInfo = method.getAnnotation(MethodInfo.class);

if ("1.0".equals(methodInfo.version())) {
                    System.out.println("Method with revision no 1.0 = "
                            + method);
                }
            }
        }
    }
}