Question

What I am trying to achieve is as follows – I have a java class which calls a URL (passed to it), which returns JSON, which calls a call back from within the calling activity which processes the data.

This allows reusability of the aSyncTask code.

In some cases I needed to pass post data to the URL being called, so I created a new method with allows me to add data

HashMap<String, String> mData;        

public void AddDataToPost(HashMap<String, String> data) {
        mData = data;
     }

Then I pass this data with my httprequest.

My question is as follows.

I want to be able to pass any type of data in. For example a HashMap.. but i cannot do this because I have head to specify the bit when I initialized the var.

I could create an addHashMap method, but the same problem arises as the var is initialized as String, String.

How would I go about reusing code whilst allowing the passing of any data form?

THanks

Answer 1

You could define your class to use raw types, e.g.

public MyClass<T>{
   ...
}

You could then do this:

MyClass<Integer> intMyClass = new MyClass<>();

MyClass<String>  strMyClass = new MyClass<>();

Note though that you cannot pass primitives so you would have to box integers and so on.

See this tutorial on Java Generics.

http://docs.oracle.com/javase/tutorial/java/generics/types.html