将类类型作为参数传递

Question

将类型作为参数传递给api

Answer 1

您可以将Class作为参数，如下所示，

 buildCriteriaQ(Class<?> parentClass) {
        CriteriaBuilder cb = factory.getCriteriaBuilder();
        CriteriaQuery cq = cb.createQuery(entityClass);
        Root<?> a = cq.from(entityClass);
        cq.select(a);

        Query query = factory.createEntityManager().createQuery(cq);
        List results = query.getResultList();
        System.out.println(results);
    }

并按如下所示调用此方法，

buildCriteriaQ(Item.class);

Answer 2

您可以尝试使用 reflection 来创建Class类型的对象的实例

例如

    Class clazz = ... //your class
    Constructor constructor = clazz.getConstructor(prepareParameterTypes(parameters));
    constructor.newInstance(parameters);