通过反射获取泛型

package edu.wtbu;

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

//通过反射获取泛型
public class Demo01 {
    public static void main(String[] args) throws NoSuchMethodException {
        Method method = Demo01.class.getMethod("test1", Map.class, List.class);
        Type[] genericParameterTypes = method.getGenericParameterTypes();
        for (Type genericParameterType : genericParameterTypes) {
//            System.out.println(genericParameterType);

            if (genericParameterType instanceof ParameterizedType){
                Type[] actualTypeArguments = ((ParameterizedType) genericParameterType).getActualTypeArguments();
                for (Type actualTypeArgument : actualTypeArguments) {
                    System.out.println(actualTypeArgument);
                }
            }
        }

        Method method1 = Demo01.class.getMethod("test2", null);
        Type genericReturnType = method1.getGenericReturnType();
        if (genericReturnType instanceof ParameterizedType){
            Type[] actualTypeArguments = ((ParameterizedType) genericReturnType).getActualTypeArguments();
            for (Type actualTypeArgument : actualTypeArguments) {
                System.out.println(actualTypeArgument);
            }
        }
    }
    public void test1(Map<String,User> map, List<User> list){
        System.out.println("test1");
    }
    public Map<String,User> test2(){
        System.out.println("test2");
        return null;
    }
}