package 反射与注解;

import 反射与注解.POJO.User;

import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.List;
import java.util.Map;

public class 泛型反射 {
    public void test01(Map<String, User> map, List<User> list) {
        System.out.println("test01");
    }

    public List<User> test02() {
        System.out.println("test02");
        return null;
    }

    public static void main(String[] args) throws NoSuchMethodException {
        System.out.println("======================================test01======================================");
        Method test01 = 泛型反射.class.getMethod("test01", Map.class, List.class);
        Type[] genericParameterTypes = test01.getGenericParameterTypes(); // 获取泛型反射类型
        for (Type genericParameterType : genericParameterTypes) {
            System.out.println("#" + genericParameterType);
            // 获取实际泛型里面的类型
            if (genericParameterType instanceof ParameterizedType) {
                Type[] actualTypeArguments = ((ParameterizedType) genericParameterType).getActualTypeArguments(); // 获取真实参数类型
                for (Type actualTypeArgument : actualTypeArguments) {
                    System.out.println("$" + actualTypeArgument);
                }

            }
        }


        System.out.println("======================================test02======================================");
        Method tes02 = 泛型反射.class.getMethod("test02");
        Type genericReturnType = tes02.getGenericReturnType();// 获取泛型反射类型
        System.out.println("#" + genericReturnType);


        // 获取实际泛型里面的类型
        if (genericReturnType instanceof ParameterizedType) {
            Type[] actualTypeArguments = ((ParameterizedType) genericReturnType).getActualTypeArguments(); // 获取真实参数类型
            for (Type actualTypeArgument : actualTypeArguments) {
                System.out.println("$" + actualTypeArgument);
            }


        }
    }

}

 

输出结果