我可以像参数一样引用子类吗？

Question

我想在我的抽象类中引用任何潜在的子类，如参数，以创建通用函数，例如在不重载的情况下创建子类的新实例。abstract class Fictional{  public static ArrayList<SUBCLASS_PARAM> subclassArray = new ArrayList<SUBCLASS_PARAM>();  int i;  private Fictional(int i) //All subclasses have to implement this constructor  {     this.i = i;     //body  }  public static SUBCLASS_PARAM loadFromFile() //I wouldn't have to override this method  {     SUBCLASS_PARAM subclass = new SUBCLASS_PARAM(1); //it's not possible to make new instance of abstract class, but it would be possible with any other subclass     subclassList.put(subclass);     return subclass;  }}class Real extends Fictional{//nothing here}class main{  Real r = Real.loadFromFile()}有什么办法可以做这样的事情吗？

Answer 1

我想在我的抽象类中引用任何潜在的子类，如参数，以创建通用函数，例如在不重载的情况下创建子类的新实例。

abstract class Fictional

{

  public static ArrayList<SUBCLASS_PARAM> subclassArray = new ArrayList<SUBCLASS_PARAM>();

  int i;

  private Fictional(int i) //All subclasses have to implement this constructor

  {

     this.i = i;

     //body

  }

  public static SUBCLASS_PARAM loadFromFile() //I wouldn't have to override this method

  {

     SUBCLASS_PARAM subclass = new SUBCLASS_PARAM(1); //it's not possible to make new instance of abstract class, but it would be possible with any other subclass

     subclassList.put(subclass);

     return subclass;

  }

}

class Real extends Fictional

{

//nothing here

}

class main

{

  Real r = Real.loadFromFile()

}

有什么办法可以做这样的事情吗？