Time: 2024-05-15 Wednesday 12:21:01
Author: Jackasher

注解配置与解析

注解的配置:

package org.example.annoation;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
public @interface Component {
    String value();
}

注解的取值:

package org.example;

import org.example.annoation.Component;

// Press Shift twice to open the Search Everywhere dialog and type `show whitespaces`,
// then press Enter. You can now see whitespace characters in your code.
public class Main {
    public static void main(String[] args) throws ClassNotFoundException {
        Class<?> aClass = Class.forName("org.example.pojo.User");
        if (aClass.isAnnotationPresent(Component.class)) {
            Component annotation = aClass.getAnnotation(Component.class);
            String value = annotation.value();
            System.out.println(value);
        }
    }
}