用抽象方法进行Java继承 [英] Java inheritance with abstract method

问题描述

我有很多表单类，它们都扩展 Form 。我有一个名为 FormService 的抽象类以及扩展此类的特定表单服务。我想要做的是有一个名为 populate（）的抽象方法，它接受一种形式的表单，从而通过继承调用给定类型的正确服务。

所以我有这样的东西：

  public abstract FormService {
 public abstract void populate（Form form）; 
} 
 
 public TestFormService extends FormService {
 public void populate（TestForm form）{
 //填充
} 
  
 $ b 
其中 TestForm 是一个扩展 Form 。这是可能的，因为我似乎无法得到我想要的影响。
  您可以使用泛型：
  public abstract FormService< F extends Form> {
 public abstract void populate（F form）; 
} 
 
 public TestFormService继承FormService< TestForm> {
 @Override 
 public void populate（TestForm form）{
 // populate 
} 
} 
  
请注意，使用  @Override  这里只是一个很好的做法，但与问题无关。
 
I have a lot of "form" classes all of which extend Form.  I have an abstract class called FormService and specific form services that extend this class.  What I want to do is have an abstract method called populate() which takes a type of form thus calling the correct service for the given type through inheritance.

So I have something like:
public abstract FormService {
    public abstract void populate(Form form);
}

public TestFormService extends FormService {
    public void populate(TestForm form) {
      //populate
    }
Where TestForm is a type that extends Form.  Is this possible because I can't seem to get the affect I want.
解决方案
You could use generics:
public abstract FormService<F extends Form> {
    public abstract void populate(F form);
}

public TestFormService extends FormService<TestForm> {
    @Override
    public void populate(TestForm form) {
      //populate
    }
}
Note that the use of @Override here is just good practice, but unrelated to the question.

                        
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