如何将多态应用于xml反序列化？

Question

I have two types of xml:

<exec><cmd>STATISTIC</cmd><param></param></exec>

<exec><cmd>FILE_TO_CLIENT</cmd><param><filePath>"/opt/tst"</filePath><msg>"ls- la"</msg></param></exec>

I need to pass them to function that might return two types of class object

class Statistic    {
}

class FileToClient
{
  String msg;
  String filePath;
}

In case the message is of type statistic - no fields are required. In case it is file_to_client , msg and filePath fields should be filled from xml.

How should I organize my class hierarchy so that the deserializer function could return both type of objects?

Answer 1

First of all.... Classes in java ALWAYS starts with UPPERCASE .
Second your question is not clear, but I will try to explain basic inheritance.

---

If you want both classes being same type to be returned by same method you need to have a common Parent class. All classes in Java inherits from Object class, but better if you define your own parent like this:

// parent class common to others
class YourParent {
    // put here any common attributes for child classes
}

Then make your child classes extend from parent:

class Statistic extends YourParent 
{
}

class FileToClient extends YourParent 
{
String msg;
String filePath;

}

Finally, you can use both FileToClient and Statistics as YourParent classes.

For example, as return type in a method:

public YourParent doSomething() {
    if (something)
        FileToClient f = //
        return f;  // valid
    } else {
        Statistic s = //
        return s;  // valid also!!!
    }
}