Java通配符错误

我有一个BaseDao接口，可以使用hibernate将数据持久化到mysql

public interface BaseDao<T extends Serializable> {
    public void saveAll(Collection<T> objects) throws PersistenceException;
}

在某些类中，我声明ActivityDao：

 protected abstract ActivityDao<Activity1> createActivityDao1();

受保护的抽象活动dao createActivityDao1（）；

以及一种方法：

 private void  persistData(ActivityDao<? extends BaseActivity> activityDao, Collection<? extends BaseActivity> data){
    EntityTransaction transaction = activityDao.getEntityManager().getTransaction();

    try {
        transaction.begin();

        activityDao.saveAll(data);
        transaction.commit();
    }
    catch (HibernateException ex) {

---

private void persistData（ActivityDao使用两个具有相同边界的有界通配符并不意味着它们是相同的类型。在这种情况下，
ActivityDao的实际类型参数是BaseActivity Serializable？是：公共抽象类BaseActivity实现了Serializable，Compariable{好吧，那将是乏味的。这是同一个问题。你必须找到某种方法使该类成为泛型类。或者你需要一些肮脏的解决方法才能使其正常工作。谢谢！删除了，因为它确实是同一个问题。我已经为集合和活动使用包装类解决了它。非常感谢你的回答！就是这样。在e发布问题我尝试将该方法实现为模板方法，但问题是，我有两个带有通配符的字段，当将它们传递给方法时，会导致相同的错误。我正在更新代码
 private void  persistData(ActivityDao<? extends BaseActivity> activityDao, Collection<? extends BaseActivity> data){
    EntityTransaction transaction = activityDao.getEntityManager().getTransaction();

    try {
        transaction.begin();

        activityDao.saveAll(data);
        transaction.commit();
    }
    catch (HibernateException ex) {

 Error:(62, 24) java: method saveAll in interface com.matomy.persistence.dao.BaseDao<T>
 cannot be applied to given types;
 required: java.util.Collection<capture#1 of ? extends
 com.matomy.persistence.entity.activities.BaseActivity>
 found: java.util.Collection<capture#2 of ? extends   com.matomy.persistence.entity.activities.BaseActivity>
 reason: actual argument java.util.Collection<capture#2 of ? extends     com.matomy.persistence.entity.activities.BaseActivity>
 cannot be converted to java.util.Collection<capture#1 of ? extends     com.matomy.persistence.entity.activities.BaseActivity> 
 by method invocation conversion

public abstract class BaseActivity implements Serializable, Comparable<BaseActivity> {

private <T extends BaseActivity> void  persistData(ActivityDao<T> activityDao, Collection<T> col){
    EntityTransaction transaction = activityDao.getEntityManager().getTransaction();

    try {
        transaction.begin();

        activityDao.saveAll(col);
        transaction.commit();
    }
    catch (HibernateException ex) {

private void  persistData(ActivityDao<CAP#1-of-? extends BaseActivity> activityDao, Collection<CAP#2-of-? extends BaseActivity> data){
    EntityTransaction transaction = activityDao.getEntityManager().getTransaction();

    try {
        transaction.begin();

        activityDao.saveAll(data);
        transaction.commit();
    }
    catch (HibernateException ex) {
    }
}

public void saveAll(Collection<CAP#1-of-? extends BaseActivity> objects) throws PersistenceException;

private <T extends BaseActivity> void persistData(ActivityDao<T> activityDao, Collection<T> data){