Java注解的使用

最新推荐文章于 2025-12-05 17:02:52 发布

原创最新推荐文章于 2025-12-05 17:02:52 发布 · 137 阅读

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#java

Main

public static void main(String[] args) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException, InstantiationException {
    
    Class<MyReflect> clazz = MyReflect.class;
    Constructor<MyReflect> constructor = clazz.getConstructor();
    MyReflect myReflect = constructor.newInstance();
    
    Field[] fields = clazz.getFields();
    for(Field field : fields) {
        MyAnnotation myAnnotation = field.getAnnotation(MyAnnotation.class);
        String val = myAnnotation.value();
        String fieldName = field.getName();
        String methodName = "set" + fieldName.substring(0, 1).toUpperCase() + fieldName.substring(1);
        Method method = clazz.getMethod(methodName, String.class);
        method.invoke(myReflect, val);
    }
    
    System.out.println(myReflect);
}

MyReflect

public class MyReflect {

    @MyAnnotation("zhangsan")
    public String name;

    @MyAnnotation("18")
    public String age;

    @MyAnnotation("男")
    public String sex;

    @Override
    public String toString() {
        return "MyReflect{" +
                "name='" + name + '\'' +
                ", age='" + age + '\'' +
                ", sex='" + sex + '\'' +
                '}';
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAge() {
        return age;
    }

    public void setAge(String age) {
        this.age = age;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

}

MyAnnotation

@Target(ElementType.FIELD)
@Retention(RetentionPolicy.RUNTIME)
@Inherited
public @interface MyAnnotation {

    String value();

}