15 获取泛型信息

了解即可

package annotate;

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


// generic Parameter Type:泛型参数类型
// ParameterizedType     :真实参数类型
public class Test15 {
    public  void test01(Map<String,Body> map , List<Body> list){
        System.out.println("test01:");
    }

    public Map<String,Body> test02(){
        System.out.println("test02:");
        return null;
    }

    public static void main(String[] args) throws Exception {
        Class c1= Test15.class;
        // 1. 输出泛型参数类型
        Method method= c1.getMethod("test01", Map.class, List.class);
        for (Type genericParameterType : method.getGenericParameterTypes()) {
            System.out.println("--"+genericParameterType);
            if (genericParameterType instanceof ParameterizedType){
                for (Type actualTypeArgument : ((ParameterizedType) genericParameterType).getActualTypeArguments()) {
                    System.out.println(actualTypeArgument);
                }
            }
        }
        System.out.println("====================");
        method= c1.getMethod("test02",null);
        Type genericReturnType = method.getGenericReturnType();
        System.out.println("--"+genericReturnType);
            if (genericReturnType instanceof ParameterizedType){
                for (Type actualTypeArgument : ((ParameterizedType) genericReturnType).getActualTypeArguments()) {
                    System.out.println(actualTypeArgument);
                }
            }

    }
}
posted @ 2023-09-14 00:19  被占用的小海海  阅读(9)  评论(0)    收藏  举报