使用反射获取泛型信息

                                                                    反射操作泛型

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                                                                      小案例测试

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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 Demo1 {
    public void test1(Map<String, 注解和反射.反射.反射概述.Demo1.User> map, List<注解和反射.反射.反射概述.Demo1.User> list) {
        System.out.println ("test1");
    }

    public Map<String, 注解和反射.反射.反射概述.Demo1.User> test2() {
        System.out.println ("test2");
        return null;
    }

    public static void main(String[] args) throws NoSuchMethodException {
        Method method = Demo1.class.getMethod ("test1", Map.class, List.class);
        Type[] geths = method.getGenericParameterTypes ();
        for (Type gethd : geths) {
            System.out.println ("#" + gethd);
            if (gethd instanceof ParameterizedType) {
                Type[] act = ((ParameterizedType) gethd).getActualTypeArguments ();
                for (Type ctt : act) {
                    System.out.println (ctt);
                }

            }

        }
        method = Demo1.class.getMethod ("test2", null);
        Type get = method.getGenericReturnType ();
        if (get instanceof ParameterizedType) {
            Type[] act = ((ParameterizedType) get).getActualTypeArguments ();
            for (Type ctt : act) {
                System.out.println (ctt);
            }
        }
    }
}