I'm trying to get my head round OOP in J.
Mainly with http://www.jsoftware.com/help/learning/25.htm
My current problem is if I create an instance of a class and, and I want to use
it as a member variable of another object, how can I do this and then call it
and its functions?
e.g.
Using the Stack example:
coclass 'Stack' create =: 3 : 'items =: 0 $ 0' push =: 3 : '# items =: (<
y) , items' top =: 3 : '> {. items' pop =: 3 : '# items =: }. items'
destroy =: codestroy S =: conew 'Stack' create__S 0
push__S 2
1 NB. create new stack T
T =: conew 'Stack' create__T 0
push__S T
2
Now T is on S's stack. And I can retrieve it by popping, but doing this does
not seem to returna reference to the actual object T, and I cannot call any of
T's methods. Is there a way to cast the returned item to a stack? Then possibly
I can call it's methods.
A Java example (not using generics):
public class MyStack{..// definitions etc}
MyStack S = new MyStack();
MyStack T = new MyStack();
S.push(T);
MyStack U = (MyStack)S.pop();//cast returned object to a MyStack
U.push(5);//do something with returned object.
Regards.
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