英文:
Java - Possible to create a parent class object that can store an instance of any subclass?
问题
我知道一个父类的数组可以存储其任何子类的实例，但是否可以使用单个对象实现这一点：
这是我希望理解的示例：
public class Parent
{
int a;
public Parent(int a)
{
this.a = a;
}
public void function1()
{
//操作
}
}
public class Child1 extends Parent
{
public Child1(int a)
{
super(a);
}
public void function2()
{
//操作
}
}
public class Child2 extends Parent
{
public Child2(int a)
{
super(a);
}
public void function3()
{
//操作
}
}
现在，如果我执行以下操作：
Parent p1;
Child1 c1 = new Child1(5);
p1 = c1;
p1.function1();
p1.function2();
我是否能够运行Parent类的function1方法以及Child1类的function2方法，使用Parent类对象p1？
如果这个问题很愚蠢，我很抱歉。我对这一切都很陌生。如果这是一个重复的问题，并且您标记它为重复，我也会感激。
英文:
I know an array of a parent class can store an instance of any it's sub-classes but is this possible with a single object:
Here's an example of what I'm hoping to understand:
public class Parent
{
int a;
public Parent(int a)
{
this.a = a;
}
public void function1()
{
//Actions
}
}
public class Child1 extends Parent
{
public Child1(int a)
{
super(a);
}
public void function2()
{
//Actions
}
}
public class Child2 extends Parent
{
public Child2(int a)
{
super(a);
}
public void function3()
{
//Actions
}
}
Now if I perform the following:
Parent p1;
Child1 c1 = new Child1(5)
p1 = c1;
p1.function1();
p1.function2();
Would I be able to run the the function1 method of the Parent class as well as thefunction2 method of the Child1 class with the Parent class object p1?
Sorry if this is a silly question. I'm new to all this. Also, if this is a duplicate and you mark it as such, I'd appreciate that too.
答案1
得分: 0
经过一些更多的尝试、错误以及额外的研究，我意识到我所希望实现的并不可能。
因此，为了我的项目，我创建了每个类的单独实例，并在需要时单独访问它们。虽然这不是我设想中的解决方案，但它作为一个有效的解决方法来绕过了我的问题。
附言：对于指出这段代码不起作用的评论，他们是对的，确实不起作用。这只是一个抽象示例，用来说明我的问题。但也许我当初不应该将其格式化为代码。我会立即更正这一点。
英文:
After some more trial and error and additional research, I realize that what I'm hoping to achieve is not possible.
As such, for my project I created separate instances of each class and accessed them individually when required. That wasn't the solution I had in mind but it served as an effective workaround to my problem.
PS: To the comment that pointed out this code wouldn't work, they are right, it doesn't. It was meant as an abstract example to illustrate my issue. But perhaps I shouldn't have formatted it as a code then. I'll change that right away.
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