/**
     * 初始化
     * @param parameter 引數
     * @return 例項化的物件
     */
    protected H init(String parameter){
        Type superClass = getClass().getGenericSuperclass();
　　　　　　//獲取第二個列舉物件
        Type type = ((ParameterizedType) superClass).getActualTypeArguments()[1];
        Class<?> clazz = getRawType(type);
        
 
try {
　　　　　　　　//獲取建構函式列表
            final Constructor<?>[] declaredConstructors = clazz.getDeclaredConstructors();
　　　　　　　　//獲取建構函式引數，定義例項化物件的引數型別
            final Constructor<?> declaredConstructor = clazz.getDeclaredConstructor(declaredConstructors[0].getParameterTypes());
            declaredConstructor.setAccessible(
 
true);
            return (H) declaredConstructor.newInstance(parameter, "qeqweqwew");
        } catch (InstantiationException | IllegalAccessException | NoSuchMethodException | InvocationTargetException e) {
            throw new ServiceException(e.getMessage(),e.getCause());
        }
    }

    /**
 

     * type不能直接例項化物件，通過type獲取class的型別，然後例項化物件
     * @param type 型別
     * @return 物件
     */
    public static Class<?> getRawType(Type type) {
        if (type instanceof Class) {
            return (Class<?>) type;
        } else if (type instanceof ParameterizedType) {
            ParameterizedType parameterizedType = (ParameterizedType) type;
            Type rawType = parameterizedType.getRawType();
            return (Class<?>) rawType;
        } else if (type instanceof GenericArrayType) {
            Type componentType = ((GenericArrayType) type).getGenericComponentType();
            return Array.newInstance(getRawType(componentType), 0).getClass();
        } else if (type instanceof TypeVariable) {
            return Object.class;
        } else if (type instanceof WildcardType) {
            return getRawType(((WildcardType) type).getUpperBounds()[0]);
        } else {
            String className = type == null ? "null" : type.getClass().getName();
            throw new IllegalArgumentException("Expected a Class, ParameterizedType, or GenericArrayType, but <" + type + "> is of type " + className);
        }
    }

https://www.cnblogs.com/tiancai/p/9603050.html
https://www.cnblogs.com/duanweishi/p/4480163.html