sub class access

[Ashok Paulraj]

How do I access the subclasses' (B,C and D - subclasses of A) methods from an external class 'Temp' ?

[Keith Lynn]

Could you be more specific about these methods? What level of access do they have?

[Ashok Paulraj]

hi,

public class B extends A {

public void setObj (List l) {}
public void instantiateTemp ()
{
Temp t = new Temp ();
t.setParent (this);
}
}

public class C extends A {

public void setObj (List l) {}
public void instantiateTemp ()
{
Temp t = new Temp ();
t.setParent (this);
}
}

public class D extends A {

public void setObj (List l) {}
public void instantiateTemp ()
{
Temp t = new Temp ();
t.setParent (this);
}
}

public class Temp
{
private A _aObj;
Temp () {..}
void setParent (A aObj) {
_aObj = aObj;
}

void compute () {

// from here I need to access setObj(List l) on B and C....
}
}

Temp is a GUI class and hence compute () won't be called until a UI action takes place......

Appreciate your help !!

[Srikanth Ramu]

I guess you want to access setObj of B and C

class in Temp class.
 
void compute () {
 
_aObj = new B();
 
_aObj.setObj(...) ;//B Class method will executed
 
_aObj = new C(); 
 
_aObj.setObj(...) ; //c Class method will executed
 
}

Or you could instantiate separate objects for respective classes.

Hope this helps.
[ April 04, 2007: Message edited by: srikanth ramu ]

[Ashok Paulraj]

the above code sample defines _aObj which is already defined in setParent(...)

Also, I could do an instanceof to determine the subclass of A but is there a neat way to do this avoiding instanceof.....